During each cycle, the travel time of dupes increases rapidly. The screenshot was taken a few seconds after hovering over the travel time and it increased from 1867s to 2027s in those few seconds. By the end of each cycle, the count is well above 10,000s. The travel time for past cycles seems to be accurate, but for current cycles, this happens.
Look at travel time for past and current cycles. Playing at speed 1. Not tested at other game speeds.