Time ahead/behind calculation

One of my favorite topics :stuck_out_tongue:

Is the time ahead/behind shown for nearby Zwifters simply distance divided by some arbitrary velocity? Or does the grade (and possibly surface type) factor into the calculation?

If the latter, is it based on some canonical setup, like a 75 kg rider on a Tron bike, with a constant 250 watt output, or…?

30kmh

Sigh. That’s too bad.