mercurial/help/config.txt

--- a/mercurial/help/config.txt	Wed Sep 27 14:30:58 2017 -0700
+++ b/mercurial/help/config.txt	Wed Sep 27 15:14:59 2017 -0700
@@ -1613,6 +1613,10 @@
     Minimum delay before showing a new topic. When set to less than 3 * refresh,
     that value will be used instead. (default: 1)
 
+``estimateinterval``
+    Maximum sampling interval in seconds for speed and estimated time
+    calculation. (default: 60)
+
 ``refresh``
     Time in seconds between refreshes of the progress bar. (default: 0.1)