According to ZP we're doing 4 laps of Watopia Hilly. So you have to figure the climbing will play a significant role. It's certainly painful and demoralizing to lose the group on the climb and not be able to latch on and suffer alone each lap (from experience).
Do you have a recorded time on this strava segment?
https://www.strava.com/segments/13433657
I'd expect the Cs to range from around 1:00 to 1:10 or maybe with a slightly expanded range to account for the additional Zwift Academy riders.
If you don't have a time for the 4 laps you could extrapolate from the single lap segment:
https://www.strava.com/segments/12118362
I did 1.05 last week