Must admit in all my years using and training on Timeslips I never noticed this. The only preference I can find for you is to start a timer when starting a new slip. This can be found under setup - preferences under new slip rules.

Thanks Caren2.  But in our office the timer is just not feasible.  Too many interruptions; all of a sudden I am 3 hrs down the road and need to enter several slips at a time.  So, now I will have to hunt down the previous slip to find the 'stop time' to use as my next 'start time'.  We find start/stop times most helpful in making sure we have accounted for the time we spend during the day.