How many times a men can able to do sex if he already masturbate?

once a week on Saturday night

It depends on who you're having sex with. It would be easy to do it with you a few times after masturbating.
But if someone was going to have sex with you,
why would they want to masturbate.
Sex is much better when shared.

I'm sure it would be very nice spending the whole day in bed with you,
but I would not want do it all day every day, even if I desired to do that.
Eventually, someone will have to go to the grocery store.

When I was young I rarely came more than twice during sex , and now it'd almost always be once. I would need a few hours after masturbation to really want sex, and it reduces the pleasure

Depends on the "man" and his virility and age.
Some teenage "men" can have sex 10 or 12 times
in succession. One Brazilian boy masturbated 42 times
in a row on webcam.

It depends on the man.

depends on age and condition

men will need some time to refill before being able to ejaculate again.