First, pace time must be enabled to view it. Open TritonWear Live (mobile app) and go to the Settings view. Select the 'Distance + Pace Time' option for the Workout Building setting.
Pace time is calculated as the time from the start of a rep to the start of the next rep. When enabled, pace time is displayed on the User view — replacing the average rep time in the list of sets. Pace time for a set is the average of the rep pace times rounded to the nearest 0.05s mark.
When the 'Distance + Pace Time' setting is selected, reps are broken out into a new set if the distance of the current rep doesn't match the distance of the previous rep AND if the pace time is greater than the previous rep's pace time + 20 seconds.