How many ejaculations does it take til I'm empty for the day?!

It entirely depends how your body rations out supplies.

Contrary to what is said up there the body never releases
all available supplies in one go.

You would have do it and see.

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Um....there's really only one way to find out the answer to that question.

I think most guys - either on their own or in a 'contest' with a friend(s) at a sleepover - try to see how many times they can come in a night or in a 24 hr period.
When I was young I think I went six or seven by myself once, and five or six one time with my best friend and me. I think the 4th time there was very little semen and it was dry on the fifth time.

It's not harmful to continue after you're empty, but you'd have to see for yourself how many ejaculations you are able to have. You might be slightly different than me or someone else.

It's different for each individual but the only way to find out for sure is for you to try it yourself. For me three seems to be my limit.

well, you usually release the whole load each time... when i do i tend to get about 4 or 5 squirts of semen