diff --git a/pytorch3d/implicitron/tools/stats.py b/pytorch3d/implicitron/tools/stats.py
index 8b7c0bcc..012ab54a 100644
--- a/pytorch3d/implicitron/tools/stats.py
+++ b/pytorch3d/implicitron/tools/stats.py
@@ -118,6 +118,7 @@ class Stats(object):
         self.plot_file = plot_file
         self.do_plot = do_plot
         self.hard_reset(epoch=epoch)
+        self._t_last_update = None
 
     @staticmethod
     def from_json_str(json_str):
@@ -215,7 +216,6 @@ class Stats(object):
             self.it[stat_set] += 1
 
         epoch = self.epoch
-        it = self.it[stat_set]
 
         for stat in self.log_vars:
 
@@ -224,10 +224,11 @@ class Stats(object):
 
             if stat == "sec/it":  # compute speed
                 if time_start is None:
-                    elapsed = 0.0
+                    time_per_it = 0.0
                 else:
-                    elapsed = time.time() - time_start
-                time_per_it = float(elapsed) / float(it + 1)
+                    now = time.time()
+                    time_per_it = now - (self._t_last_update or time_start)
+                    self._t_last_update = now
                 val = time_per_it
             else:
                 if stat in preds: