If you constrain it to an 8 hour spread, it does indeed help things—you’d only need around 34 people agreeing to commit to 1 hour, so even more optimistic than your guess. And if we do get people to coordinate smaller specific time slots, perhaps convincing 25% to take a 1.5 hour slot and the rest to commit a minimum of 1 hour, this moves things closer to only needing a group of 30. Not too bad.
If you constrain it to an 8 hour spread, it does indeed help things—you’d only need around 34 people agreeing to commit to 1 hour, so even more optimistic than your guess. And if we do get people to coordinate smaller specific time slots, perhaps convincing 25% to take a 1.5 hour slot and the rest to commit a minimum of 1 hour, this moves things closer to only needing a group of 30. Not too bad.