diff --git a/app.py b/app.py
index ba877de..25e91c0 100644
--- a/app.py
+++ b/app.py
@@ -2566,8 +2566,8 @@ def clear_history():
                         os.unlink(file_path)
                     elif os.path.isdir(file_path):
                         shutil.rmtree(file_path)
-                except Exception:
-                    pass
+                except Exception as exc:
+                    logger.warning("Failed to remove execution log entry %s: %s", file_path, exc)
 
         # Clear session logs
         if os.path.exists(SESSION_LOG_DIR):
@@ -2578,8 +2578,8 @@ def clear_history():
                         os.unlink(file_path)
                     elif os.path.isdir(file_path):
                         shutil.rmtree(file_path)
-                except Exception:
-                    pass
+                except Exception as exc:
+                    logger.warning("Failed to remove session log entry %s: %s", file_path, exc)
 
         return jsonify({
             'success': True,
diff --git a/ui/app.js b/ui/app.js
index bf7725b..6174ae2 100644
--- a/ui/app.js
+++ b/ui/app.js
@@ -70,6 +70,7 @@ let state = {
     sessionId: null,
     lastSaveTimestamp: 0,
     runningScripts: {},  // termId -> { step, total, command, status }
+    terminalTimerInterval: null,
     reliabilitySummary: null,
     reliabilityFailures: null,
     reliabilityTrends: null,
@@ -1035,11 +1036,51 @@ function cleanupRunningScript(termId) {
     delete state.runningScripts[termId];
 
     if (termId === state.activeTerminalId) {
+        stopTerminalTimer();
         updateRunButton();
         updateProgressTrackerUI();
     }
 }
 
+function formatElapsedTime(ms) {
+    const totalSeconds = Math.max(0, Math.floor(ms / 1000));
+    const minutes = String(Math.floor(totalSeconds / 60)).padStart(2, '0');
+    const seconds = String(totalSeconds % 60).padStart(2, '0');
+    return `${minutes}:${seconds}`;
+}
+
+function updateTerminalTimer() {
+    const timer = document.getElementById('terminal-session-timer');
+    if (!timer) return;
+
+    const running = state.runningScripts[state.activeTerminalId];
+    if (!running?.startedAt) {
+        timer.style.display = 'none';
+        timer.textContent = '00:00';
+        return;
+    }
+
+    timer.textContent = formatElapsedTime(Date.now() - running.startedAt);
+    timer.style.display = 'inline-flex';
+}
+
+function startTerminalTimer() {
+    stopTerminalTimer(false);
+    updateTerminalTimer();
+    state.terminalTimerInterval = setInterval(updateTerminalTimer, 1000);
+}
+
+function stopTerminalTimer(reset = true) {
+    if (state.terminalTimerInterval) {
+        clearInterval(state.terminalTimerInterval);
+        state.terminalTimerInterval = null;
+    }
+
+    if (reset) {
+        updateTerminalTimer();
+    }
+}
+
 async function abortScriptRun(termId = state.activeTerminalId) {
     const running = state.runningScripts[termId];
     if (!running) return;
@@ -1145,9 +1186,11 @@ async function executeScriptWithArguments(relPath, argumentsText) {
         total: 0,
         command: 'Starting script...',
         status: 'running',
+        startedAt: Date.now(),
         controller: controller
     };
     updateRunButton();
+    startTerminalTimer();
 
     if (termId === state.activeTerminalId) {
         runStatus.textContent = 'Executing...';
@@ -2805,9 +2848,11 @@ function switchTerminal(id) {
         runStatus.textContent = running.aborting ? 'Aborting...' : 'Executing...';
         runStatus.className = 'run-status running';
         resourcePanel.style.display = 'none';
+        startTerminalTimer();
     } else {
         runStatus.textContent = '';
         runStatus.className = 'run-status';
+        stopTerminalTimer();
     }
     updateRunButton();
     highlightTerminalSearch();
diff --git a/ui/index.html b/ui/index.html
index 58399eb..9fa238b 100644
--- a/ui/index.html
+++ b/ui/index.html
@@ -360,6 +360,7 @@ <h2>Scripts</h2>
                             <span id="cli-search-results"></span>
                         </div>
                         <span class="run-status" id="run-status"></span>
+                        <span class="timer-badge" id="terminal-session-timer" aria-live="polite" style="display: none;">00:00</span>
                         <button class="btn-icon" id="btn-lock-terminal" title="Lock Terminal"
                             aria-label="Lock terminal">
                             <svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24"
diff --git a/ui/style.css b/ui/style.css
index 312720a..28e634e 100644
--- a/ui/style.css
+++ b/ui/style.css
@@ -1768,6 +1768,20 @@ body {
     animation: pulse 1.5s infinite;
 }
 
+.timer-badge {
+    align-items: center;
+    min-width: 46px;
+    height: 24px;
+    padding: 0 8px;
+    border: 1px solid rgba(245, 158, 11, 0.35);
+    border-radius: 999px;
+    background: rgba(245, 158, 11, 0.08);
+    color: var(--accent-orange);
+    font-family: var(--font-mono);
+    font-size: 11px;
+    font-weight: 600;
+}
+
 @keyframes pulse {
 
     0%,