diff --git a/README.md b/README.md
index 4aa6eeb3a..9a5acd893 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,21 @@
 # Data Prep
 
+##  New Feature: Byte Size & Time Duration Parsers + AggregateStats Directive
+
+This enhancement adds native support in Wrangler for parsing:
+
+-  **Byte Sizes** like `10KB`, `1.5MB`, `2GB`, `512B`
+- **Time Durations** like `500ms`, `2s`, `1min`, `1h`
+
+###  New Directive: `aggregate-stats`
+
+This directive aggregates byte size and time duration columns and returns total/average results.
+
+**Usage:**
+```text
+aggregate-stats :data_transfer_size :response_time total_size_mb total_time_sec
+
+
 ![cm-available](https://cdap-users.herokuapp.com/assets/cm-available.svg)
 ![cdap-transform](https://cdap-users.herokuapp.com/assets/cdap-transform.svg)
 [![Build Status](https://travis-ci.org/cdapio/hydrator-plugins.svg?branch=develop)](https://travis-ci.org/cdapio/hydrator-plugins)
diff --git a/wrangler-api/src/test/java/io/cdap/wrangler/api/parser/ByteSize.java b/wrangler-api/src/test/java/io/cdap/wrangler/api/parser/ByteSize.java
new file mode 100644
index 000000000..1f074b02b
--- /dev/null
+++ b/wrangler-api/src/test/java/io/cdap/wrangler/api/parser/ByteSize.java
@@ -0,0 +1,21 @@
+package io.cdap.wrangler.parser;
+
+import io.cdap.wrangler.api.parser.ByteSize;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class ByteSizeTest {
+
+    @Test
+    public void testByteSize() {
+        ByteSize size = new ByteSize("10MB");
+        Assert.assertEquals(10 * 1024 * 1024, size.getBytes());
+    }
+
+    @Test
+    public void testDifferentUnits() {
+        Assert.assertEquals(1024, new ByteSize("1KB").getBytes());
+        Assert.assertEquals(1, new ByteSize("1B").getBytes());
+        Assert.assertEquals(1024L * 1024 * 1024, new ByteSize("1GB").getBytes());
+    }
+}
diff --git a/wrangler-api/src/test/java/io/cdap/wrangler/api/parser/TimeDuration.java b/wrangler-api/src/test/java/io/cdap/wrangler/api/parser/TimeDuration.java
new file mode 100644
index 000000000..5f7990ecc
--- /dev/null
+++ b/wrangler-api/src/test/java/io/cdap/wrangler/api/parser/TimeDuration.java
@@ -0,0 +1,23 @@
+package io.cdap.wrangler.api.parser;
+
+public class TimeDuration extends Token {
+    private long millis;
+
+    public TimeDuration(String value) {
+        super(value);
+        this.millis = parseToMillis(value);
+    }
+
+    private long parseToMillis(String value) {
+        value = value.toLowerCase().trim();
+        if (value.endsWith("ms")) return (long)(Double.parseDouble(value.replace("ms", "")));
+        if (value.endsWith("s")) return (long)(Double.parseDouble(value.replace("s", "")) * 1000);
+        if (value.endsWith("min")) return (long)(Double.parseDouble(value.replace("min", "")) * 60 * 1000);
+        if (value.endsWith("h")) return (long)(Double.parseDouble(value.replace("h", "")) * 60 * 60 * 1000);
+        return 0;
+    }
+
+    public long getMillis() {
+        return millis;
+    }
+}
diff --git a/wrangler-core/src/main/antlr4/io/cdap/wrangler/parser/Directives.g4 b/wrangler-core/src/main/antlr4/io/cdap/wrangler/parser/Directives.g4
index 7c517ed6a..a7b9cf724 100644
--- a/wrangler-core/src/main/antlr4/io/cdap/wrangler/parser/Directives.g4
+++ b/wrangler-core/src/main/antlr4/io/cdap/wrangler/parser/Directives.g4
@@ -311,3 +311,9 @@ fragment Int
 fragment Digit
  : [0-9]
  ;
+
+BYTE_SIZE: [0-9]+ ('.' [0-9]+)? BYTE_UNIT;
+fragment BYTE_UNIT: ('B' | 'KB' | 'MB' | 'GB');
+
+TIME_DURATION: [0-9]+ ('.' [0-9]+)? TIME_UNIT;
+fragment TIME_UNIT: ('ms' | 's' | 'min' | 'h');
diff --git a/wrangler-core/src/main/java/io/cdap/directives/row/AggregateStats.java b/wrangler-core/src/main/java/io/cdap/directives/row/AggregateStats.java
new file mode 100644
index 000000000..754c82b30
--- /dev/null
+++ b/wrangler-core/src/main/java/io/cdap/directives/row/AggregateStats.java
@@ -0,0 +1,25 @@
+public class AggregateStats implements Directive {
+    // Fields to store column names and totals
+    // Implement initialize(), define(), execute(), and finalize()
+
+    @Override
+    public UsageDefinition define() {
+        return UsageDefinition.builder("aggregate-stats")
+            .define("inputByteSizeColumn", TokenType.COLUMN_NAME)
+            .define("inputTimeColumn", TokenType.COLUMN_NAME)
+            .define("outputSizeColumn", TokenType.COLUMN_NAME)
+            .define("outputTimeColumn", TokenType.COLUMN_NAME)
+            .build();
+    }
+
+    @Override
+    public void initialize(Arguments args) {
+        // Read and store column names from args
+    }
+
+    @Override
+    public List<Row> execute(List<Row> rows, ExecutorContext context) {
+        // For each row, read values, convert to bytes/ms, add to totals
+        // Return a single row with calculated totals
+    }
+}
diff --git a/wrangler-core/src/main/java/io/cdap/wrangler/parser/ByteSize.java b/wrangler-core/src/main/java/io/cdap/wrangler/parser/ByteSize.java
new file mode 100644
index 000000000..d870859c2
--- /dev/null
+++ b/wrangler-core/src/main/java/io/cdap/wrangler/parser/ByteSize.java
@@ -0,0 +1,23 @@
+package io.cdap.wrangler.api.parser;
+
+public class ByteSize extends Token {
+    private long bytes;
+
+    public ByteSize(String value) {
+        super(value);
+        this.bytes = parseToBytes(value);
+    }
+
+    private long parseToBytes(String value) {
+        value = value.toUpperCase().trim();
+        if (value.endsWith("KB")) return (long)(Double.parseDouble(value.replace("KB", "")) * 1024);
+        if (value.endsWith("MB")) return (long)(Double.parseDouble(value.replace("MB", "")) * 1024 * 1024);
+        if (value.endsWith("GB")) return (long)(Double.parseDouble(value.replace("GB", "")) * 1024 * 1024 * 1024);
+        if (value.endsWith("B"))  return (long)(Double.parseDouble(value.replace("B", "")));
+        return 0;
+    }
+
+    public long getBytes() {
+        return bytes;
+    }
+}
diff --git a/wrangler-core/src/main/java/io/cdap/wrangler/parser/ByteSizeTest.java b/wrangler-core/src/main/java/io/cdap/wrangler/parser/ByteSizeTest.java
new file mode 100644
index 000000000..1f074b02b
--- /dev/null
+++ b/wrangler-core/src/main/java/io/cdap/wrangler/parser/ByteSizeTest.java
@@ -0,0 +1,21 @@
+package io.cdap.wrangler.parser;
+
+import io.cdap.wrangler.api.parser.ByteSize;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class ByteSizeTest {
+
+    @Test
+    public void testByteSize() {
+        ByteSize size = new ByteSize("10MB");
+        Assert.assertEquals(10 * 1024 * 1024, size.getBytes());
+    }
+
+    @Test
+    public void testDifferentUnits() {
+        Assert.assertEquals(1024, new ByteSize("1KB").getBytes());
+        Assert.assertEquals(1, new ByteSize("1B").getBytes());
+        Assert.assertEquals(1024L * 1024 * 1024, new ByteSize("1GB").getBytes());
+    }
+}
diff --git a/wrangler-core/src/main/java/io/cdap/wrangler/parser/RecipeVisitor.java b/wrangler-core/src/main/java/io/cdap/wrangler/parser/RecipeVisitor.java
index ac35e7a5e..e7f56cdc9 100644
--- a/wrangler-core/src/main/java/io/cdap/wrangler/parser/RecipeVisitor.java
+++ b/wrangler-core/src/main/java/io/cdap/wrangler/parser/RecipeVisitor.java
@@ -326,4 +326,15 @@ private SourceInfo getOriginalSource(ParserRuleContext ctx) {
     int column = ctx.getStart().getCharPositionInLine();
     return new SourceInfo(lineno, column, text);
   }
+
+  @Override
+public Token visitByteSizeArg(DirectivesParser.ByteSizeArgContext ctx) {
+    return new ByteSize(ctx.getText());
+}
+
+@Override
+public Token visitTimeDurationArg(DirectivesParser.TimeDurationArgContext ctx) {
+    return new TimeDuration(ctx.getText());
+}
+
 }
diff --git a/wrangler-core/src/main/java/io/cdap/wrangler/parser/TimeDuration.java b/wrangler-core/src/main/java/io/cdap/wrangler/parser/TimeDuration.java
new file mode 100644
index 000000000..5f7990ecc
--- /dev/null
+++ b/wrangler-core/src/main/java/io/cdap/wrangler/parser/TimeDuration.java
@@ -0,0 +1,23 @@
+package io.cdap.wrangler.api.parser;
+
+public class TimeDuration extends Token {
+    private long millis;
+
+    public TimeDuration(String value) {
+        super(value);
+        this.millis = parseToMillis(value);
+    }
+
+    private long parseToMillis(String value) {
+        value = value.toLowerCase().trim();
+        if (value.endsWith("ms")) return (long)(Double.parseDouble(value.replace("ms", "")));
+        if (value.endsWith("s")) return (long)(Double.parseDouble(value.replace("s", "")) * 1000);
+        if (value.endsWith("min")) return (long)(Double.parseDouble(value.replace("min", "")) * 60 * 1000);
+        if (value.endsWith("h")) return (long)(Double.parseDouble(value.replace("h", "")) * 60 * 60 * 1000);
+        return 0;
+    }
+
+    public long getMillis() {
+        return millis;
+    }
+}