--- a/mercurial/dispatch.py	Wed Feb 15 13:17:39 2017 -0800
+++ b/mercurial/dispatch.py	Wed Feb 15 13:17:45 2017 -0800
@@ -137,6 +137,9 @@
     finally:
         duration = util.timer() - starttime
         req.ui.flush()
+        if req.ui.logblockedtimes:
+            req.ui._blockedtimes['command_duration'] = duration * 1000
+            req.ui.log('uiblocked', 'ui blocked ms', **req.ui._blockedtimes)
         req.ui.log("commandfinish", "%s exited %s after %0.2f seconds\n",
                    msg, ret or 0, duration)
     return ret