diff --git a/lisp/build.el b/lisp/build.el
index 298e417..b344f99 100755
--- a/lisp/build.el
+++ b/lisp/build.el
@@ -327,13 +327,17 @@ Created with %c on <a href=\"https://www.archlinux.org/\">Arch</a> <a href=\"htt
 (defun z/build-full ()
   "Full rebuild: Org, assets, and search index."
   (interactive)
-  (message "🚧 Starting full rebuild at %s" (current-time-string))
-  (setq z/build-full-rebuild t)
-  (z/generate-all-files-org)
-  (z/org-publish-quiet "org-roam" t)
-  (z/org-publish-quiet "org-static" t)
-  (message "✅ Full rebuild complete")
-  (message "🏁 Finished full rebuild at %s" (current-time-string)))
+  (let* ((start-time (current-time)))
+    (message "🏁 Starting full rebuild at %s"
+             (format-time-string "%Y-%m-%d %H:%M:%S" start-time))
+
+    (setq z/build-full-rebuild t)
+    (z/generate-all-files-org)
+    (z/org-publish-quiet "org-roam" t)
+    (z/org-publish-quiet "org-static" t)
+
+    (let ((elapsed (float-time (time-subtract (current-time) start-time))))
+      (message "✅ Full rebuild complete in %.2f seconds" elapsed))))
 
 (defun z/build-fast ()
   "Fast rebuild: Org + assets only (no JSON)."