--- a/TimeDuration.st	Wed Jan 31 09:36:10 2018 +0100
+++ b/TimeDuration.st	Wed Jan 31 10:03:29 2018 +0100
@@ -1201,14 +1201,18 @@
                     overAllSeconds > 2 ifTrue:[
                         overAllSeconds > 10 ifTrue:[
                             overAllSeconds > 300 ifTrue:[
+                               "/ no decimal above 300 seconds
                                 fmt := fmt , '%Ss'
                             ] ifFalse:[
+                               "/ 1 decimals up to 300 seconds
                                 fmt := fmt , '%S.%(milli1)s'
                             ]
                         ] ifFalse:[
+                           "/ 2 decimals up to 10seconds
                             fmt := fmt , '%S.%(milli2)s'
                         ]
                     ] ifFalse:[
+                        "/ millis up to 2seconds
                         fmt := fmt , '%S.%is'
                     ]
                 ]
@@ -1224,6 +1228,9 @@
 
     "
      (TimeDuration hours:0 minutes:0 seconds:0 milliseconds:12) formatForPrinting
+     (TimeDuration hours:0 minutes:0 seconds:2 milliseconds:12) formatForPrinting 
+     (TimeDuration hours:0 minutes:0 seconds:8 milliseconds:12) formatForPrinting  
+     (TimeDuration hours:0 minutes:0 seconds:10 milliseconds:12) formatForPrinting  
 
      (TimeDuration hours:0 minutes:0 seconds:0 milliseconds:123) formatForPrinting
      (TimeDuration hours:0 minutes:0 seconds:10 milliseconds:123) formatForPrinting