The time control is Blitz– 10 minutes per player per game in a one-hour event, so you’d expect up to 3 games in that time. This could be more if your games are completed in shorter time: there are no rounds, so you get paired after each game, with as many games as you can fit in one hour.
The organisers have a Just Giving page (Mike Hill, fundraising for NHS Together) for voluntary donations of any amount. A good cause! I will be playing again tomorrow, 9th May: the events are each Saturday 2pm for one hour, on chess.com.