diff --git a/js/ui/drawing-tools.js b/js/ui/drawing-tools.js
index a743357..db4baa3 100644
--- a/js/ui/drawing-tools.js
+++ b/js/ui/drawing-tools.js
@@ -658,9 +658,17 @@ export class DrawingManager {
                         
                         // Time duration
                         const diffSec = Math.abs(d.p2.time - d.p1.time);
-                        const h = Math.floor(diffSec / 3600);
-                        const m = Math.floor((diffSec % 3600) / 60);
-                        const timeStr = `${h}h${m > 0 ? ` ${m}m` : ''}`;
+                        let timeStr = "";
+                        if (diffSec >= 86400) {
+                            const days = Math.floor(diffSec / 86400);
+                            const hours = Math.floor((diffSec % 86400) / 3600);
+                            const mins = Math.floor((diffSec % 3600) / 60);
+                            timeStr = `${days}d${hours > 0 ? ` ${hours}h` : ''}${mins > 0 ? ` ${mins}m` : ''}`;
+                        } else {
+                            const hours = Math.floor(diffSec / 3600);
+                            const mins = Math.floor((diffSec % 3600) / 60);
+                            timeStr = `${hours}h${mins > 0 ? ` ${mins}m` : ''}`;
+                        }
                         
                         const volStr = totalVol > 1000 ? `${(totalVol/1000).toFixed(3)}K` : totalVol.toFixed(0);