I would never measure how much ejaculate I would produce but I can explain by description what I have accomplished. When I was newly wed over 25 years ago my wife and I travelled up north in Ontario for some R&R. We visited a sex shop and she wanted to buy a strap on just for fun she said....Well that evening in a motel room things got hot and she slipped that thing on herself and she was chasing me in the room with it. Hahahaha it was all fun and game until she pegged me...while we were in a standing position and she was behind me I blew my load...being erected it flew in front of my face and landed on her head. this was quite a load because her hair was soaked through and through..she needed 2 shampoo to remove it.
Another time with a SP in missionary and when I told her I was about to explode she asked that I splur it all over her face...I guess you could call it a facial, she was well covered from her hairline to her chin.
Last one was again with an SP and when I released my nut butter she had to have it in her mouth...it was more then she ever had before so some went between her lips and my shaft....don't worry she came back to clean it all up after.