diff --git a/drools-drl/drools-drl-parser-tests/src/test/java/org/drools/drl/parser/antlr4/MiscDRLParserTest.java b/drools-drl/drools-drl-parser-tests/src/test/java/org/drools/drl/parser/antlr4/MiscDRLParserTest.java
index e81bfb21f0c..ab2f7070606 100644
--- a/drools-drl/drools-drl-parser-tests/src/test/java/org/drools/drl/parser/antlr4/MiscDRLParserTest.java
+++ b/drools-drl/drools-drl-parser-tests/src/test/java/org/drools/drl/parser/antlr4/MiscDRLParserTest.java
@@ -5216,4 +5216,20 @@ void doubleAmpersandInfixAndInAccumulate() {
         assertThat(accumulateFunction.getFunction()).isEqualTo("average");
         assertThat(accumulateFunction.getParams()).containsExactly("$a + $b");
     }
+
+    @Test
+    void durationChunk() {
+        final String text =
+                "rule R\n" +
+                        "  duration (wrong input) \n" +
+                        "when\n" +
+                        "then\n" +
+                        "end";
+        RuleDescr rule = parseAndGetFirstRuleDescr(text);
+        assertThat(rule.getAttributes()).containsKey("duration");
+        assertThat(rule.getAttributes().get("duration").getType()).isEqualTo(AttributeDescr.Type.EXPRESSION);
+
+        // At the moment, the parser accepts any input and let the compile phase validate it.
+        assertThat(rule.getAttributes().get("duration").getValue()).isEqualTo("wrong input");
+    }
 }
diff --git a/drools-drl/drools-drl-parser/src/main/antlr4/org/drools/drl/parser/antlr4/DRLParser.g4 b/drools-drl/drools-drl-parser/src/main/antlr4/org/drools/drl/parser/antlr4/DRLParser.g4
index 251f73f2508..cf1afb97862 100644
--- a/drools-drl/drools-drl-parser/src/main/antlr4/org/drools/drl/parser/antlr4/DRLParser.g4
+++ b/drools-drl/drools-drl-parser/src/main/antlr4/org/drools/drl/parser/antlr4/DRLParser.g4
@@ -445,7 +445,7 @@ attribute : name=( 'salience' | 'enabled' ) conditionalAttributeValue #expressio
           | name=( 'agenda-group' | 'activation-group' | 'ruleflow-group' | 'date-effective' | 'date-expires' | 'dialect' ) DRL_STRING_LITERAL #stringAttribute
           | name='calendars' DRL_STRING_LITERAL ( COMMA DRL_STRING_LITERAL )* #stringListAttribute
           | name='timer' ( DECIMAL_LITERAL | LPAREN chunk RPAREN ) #intOrChunkAttribute
-          | name='duration' ( DECIMAL_LITERAL | TIME_INTERVAL | LPAREN TIME_INTERVAL RPAREN ) #durationAttribute
+          | name='duration' ( DECIMAL_LITERAL | LPAREN chunk RPAREN ) #intOrChunkAttribute
           ;
 
 conditionalAttributeValue : ( LPAREN conditionalExpression RPAREN | conditionalExpression ) ;
diff --git a/drools-drl/drools-drl-parser/src/main/java/org/drools/drl/parser/antlr4/DRLVisitorImpl.java b/drools-drl/drools-drl-parser/src/main/java/org/drools/drl/parser/antlr4/DRLVisitorImpl.java
index 4e6192ecad6..39aa5e930e8 100644
--- a/drools-drl/drools-drl-parser/src/main/java/org/drools/drl/parser/antlr4/DRLVisitorImpl.java
+++ b/drools-drl/drools-drl-parser/src/main/java/org/drools/drl/parser/antlr4/DRLVisitorImpl.java
@@ -514,21 +514,6 @@ public AttributeDescr visitIntOrChunkAttribute(DRLParser.IntOrChunkAttributeCont
         return attributeDescr;
     }
 
-    @Override
-    public AttributeDescr visitDurationAttribute(DRLParser.DurationAttributeContext ctx) {
-        AttributeDescr attributeDescr = BaseDescrFactory.builder(new AttributeDescr(ctx.name.getText()))
-                .withParserRuleContext(ctx)
-                .build();
-        if (ctx.DECIMAL_LITERAL() != null) {
-            attributeDescr.setValue(ctx.DECIMAL_LITERAL().getText());
-            attributeDescr.setType(AttributeDescr.Type.NUMBER);
-        } else {
-            attributeDescr.setValue(unescapeJava(safeStripStringDelimiters(ctx.TIME_INTERVAL().getText())));
-            attributeDescr.setType(AttributeDescr.Type.EXPRESSION);
-        }
-        return attributeDescr;
-    }
-
     /**
      * entry point for LHS
      */