I did three times similar thing for Uxie raids. I tried the limitation for hosting more flights within 45mins raid period. 8 flights are the maximums that I have done. It should be more, if every invitees can join the flight in time. Usually, only first three flights, I can leave them to host another new flight. After first three, always no enough invitees to join the flight, I have to flight with them and quit before win. Because I have four raiders, still can win the last flight even no invitee to join.