Auto pause 'off'. The main screen has time, speed, and power. I don't look at averages until the data is in RWGPS or Strava and can post process the data.
With the clock running I feel I'm more conscientious about breaks and don't dilly-dally about. Exchange fluids, grab snacks, and back on the bike. With stops, I like to maintain around 4hours for a 100km as long as it's not terribly hilly. Usually this comes to ~20mins for a couple stops and ~3h40m of bike time.