diff --git a/anki/sched.py b/anki/sched.py
index 475b47b87..150ea327b 100644
--- a/anki/sched.py
+++ b/anki/sched.py
@@ -105,13 +105,14 @@ order by due""" % self._groupLimit(),
         "A very rough estimate of time to review."
         (cnt, sum) = self.deck.db.first("""
 select count(), sum(taken) from (select * from revlog
-order by time desc limit 100)""")
+order by time desc limit 10)""")
         if not cnt:
             return 0
         avg = sum / float(cnt)
         c = self.counts()
-        # Here we just assume new/lrn will require 3x the number of reviews. A
-        # more complex solution can be added in the future.
+        # Here we just assume new/lrn will require 3x the number of reviews.
+        # To improve on this we'll need to make grade count down so we can get
+        # a decent picture of required steps.
         return (avg*c[0]*3 + avg*c[1]*3 + avg*c[2]) / 1000.0
 
     # Counts