I’ve had three sets of ejaculation within a few minutes; and I once did seven on one day, and was completely exhausted (spent) for days. Can hardly imagine even one more, like Bird’s eight in one day. When binge-jacking, I’ve had a few five-eruption days; and also a few all-day lovemaking sessions that have had three, four, five spurting orgasms.
Except for my seven-in-a-day, all other multiple ejaculation days have come after a week or two-week long course of cultivation — saving my load and taking lots of herbs and supplements, and eating specifically to build my load every day (including lots of watermelon and watery vegetables).
I don’t think these kinds of binges are healthy. After shooting a lot I can notice the effects for several days, even weeks. Lower energy, especially. I can return to full volume of semen quickly, but hardness or sensitivity of erection can take longer to recover.
Read about my machine-gun shot (spurts shooting out twice as fast as normal) in this thread: Is it possible to continue after first ejaculation?