diff --git a/codex-rs/core/src/tools/parallel.rs b/codex-rs/core/src/tools/parallel.rs
index 7340f5cc..baa5321d 100644
--- a/codex-rs/core/src/tools/parallel.rs
+++ b/codex-rs/core/src/tools/parallel.rs
@@ -1,4 +1,5 @@
 use std::sync::Arc;
+use std::time::Instant;
 
 use tokio::sync::RwLock;
 use tokio_util::either::Either;
@@ -53,13 +54,16 @@ impl ToolCallRuntime {
         let turn = Arc::clone(&self.turn_context);
         let tracker = Arc::clone(&self.tracker);
         let lock = Arc::clone(&self.parallel_execution);
-        let aborted_response = Self::aborted_response(&call);
+        let started = Instant::now();
         let readiness = self.turn_context.tool_call_gate.clone();
 
         let handle: AbortOnDropHandle<Result<ResponseInputItem, FunctionCallError>> =
             AbortOnDropHandle::new(tokio::spawn(async move {
                 tokio::select! {
-                    _ = cancellation_token.cancelled() => Ok(aborted_response),
+                    _ = cancellation_token.cancelled() => {
+                        let secs = started.elapsed().as_secs_f32().max(0.1);
+                        Ok(Self::aborted_response(&call, secs))
+                    },
                     res = async {
                         tracing::info!("waiting for tool gate");
                         readiness.wait_ready().await;
@@ -71,7 +75,7 @@ impl ToolCallRuntime {
                         };
 
                         router
-                            .dispatch_tool_call(session, turn, tracker, call)
+                            .dispatch_tool_call(session, turn, tracker, call.clone())
                             .await
                     } => res,
                 }
@@ -91,23 +95,32 @@ impl ToolCallRuntime {
 }
 
 impl ToolCallRuntime {
-    fn aborted_response(call: &ToolCall) -> ResponseInputItem {
+    fn aborted_response(call: &ToolCall, secs: f32) -> ResponseInputItem {
         match &call.payload {
             ToolPayload::Custom { .. } => ResponseInputItem::CustomToolCallOutput {
                 call_id: call.call_id.clone(),
-                output: "aborted".to_string(),
+                output: Self::abort_message(call, secs),
             },
             ToolPayload::Mcp { .. } => ResponseInputItem::McpToolCallOutput {
                 call_id: call.call_id.clone(),
-                result: Err("aborted".to_string()),
+                result: Err(Self::abort_message(call, secs)),
             },
             _ => ResponseInputItem::FunctionCallOutput {
                 call_id: call.call_id.clone(),
                 output: FunctionCallOutputPayload {
-                    content: "aborted".to_string(),
+                    content: Self::abort_message(call, secs),
                     ..Default::default()
                 },
             },
         }
     }
+
+    fn abort_message(call: &ToolCall, secs: f32) -> String {
+        match call.tool_name.as_str() {
+            "shell" | "container.exec" | "local_shell" | "unified_exec" => {
+                format!("Wall time: {secs:.1} seconds\naborted by user")
+            }
+            _ => format!("aborted by user after {secs:.1}s"),
+        }
+    }
 }
diff --git a/codex-rs/core/tests/suite/abort_tasks.rs b/codex-rs/core/tests/suite/abort_tasks.rs
index c9d59508..6c037395 100644
--- a/codex-rs/core/tests/suite/abort_tasks.rs
+++ b/codex-rs/core/tests/suite/abort_tasks.rs
@@ -1,3 +1,4 @@
+use assert_matches::assert_matches;
 use std::sync::Arc;
 use std::time::Duration;
 
@@ -13,6 +14,7 @@ use core_test_support::responses::sse;
 use core_test_support::responses::start_mock_server;
 use core_test_support::test_codex::test_codex;
 use core_test_support::wait_for_event_with_timeout;
+use regex_lite::Regex;
 use serde_json::json;
 
 /// Integration test: spawn a long‑running shell tool via a mocked Responses SSE
@@ -123,6 +125,7 @@ async fn interrupt_tool_records_history_entries() {
     )
     .await;
 
+    tokio::time::sleep(Duration::from_secs_f32(0.1)).await;
     codex.submit(Op::Interrupt).await.unwrap();
 
     wait_for_event_with_timeout(
@@ -159,9 +162,26 @@ async fn interrupt_tool_records_history_entries() {
         response_mock.saw_function_call(call_id),
         "function call not recorded in responses payload"
     );
-    assert_eq!(
-        response_mock.function_call_output_text(call_id).as_deref(),
-        Some("aborted"),
-        "aborted function call output not recorded in responses payload"
+    let output = response_mock
+        .function_call_output_text(call_id)
+        .expect("missing function_call_output text");
+    let re = Regex::new(r"^Wall time: ([0-9]+(?:\.[0-9])?) seconds\naborted by user$")
+        .expect("compile regex");
+    let captures = re.captures(&output);
+    assert_matches!(
+        captures.as_ref(),
+        Some(caps) if caps.get(1).is_some(),
+        "aborted message with elapsed seconds"
+    );
+    let secs: f32 = captures
+        .expect("aborted message with elapsed seconds")
+        .get(1)
+        .unwrap()
+        .as_str()
+        .parse()
+        .unwrap();
+    assert!(
+        secs >= 0.1,
+        "expected at least one tenth of a second of elapsed time, got {secs}"
     );
 }