For both masterbation and sex?
Masterbation: well over 12 several days over the course of my life. If I had entire days by myself when I was younger and access to any sort of porn I'd jack off all day. Do the same now but I edge.

Sex: first gf and I were separated for several weeks and when we saw each other again we had sex 10 times in one day. We had to buy lube halfway through the day.

Last year my gf and I were at her family's beach house on new years day. It rained all day and we lay in bed, drank champagne and fucked at least 8 times.

I did it sixteen times in one day.

Three times jacking off and three times fucking in one day for me.

5 times many years ago on a business trip. This year I've done it twice in 1 day a couple of times and that seems to be my limit now.

Most times ive jerked in a day is 7, could have been more though!

5j/o and 2 sex

The most times I have cum in one day is 8. Never counted the times that I stroked my cock in one day and did not cum.

Thye most times I have masturbated and cum in one day is five times. Would love to have cum more but my penis just stayed flacid after the fifth cum

Back in my college days i was always boasting on how much i could come and was challenged by two girls who told me if i could do it at least 8 times they would get naked in front of me o i made it okay but i was so tired i could do nothing for the two girls i mean i fell asleep with 2 naked girls in my bed dam that sucked

weekdays 3 or 4 times...weekends too many times to count. i can't get enough of the great feeling we all know and love.

I've cum about 9 times one day...I was bored lol

Most was 8x in a day when I was a teen

Jacked 12 times within 8 hours when I was 13...skipped school to read porn I found in my dad's room and just stroked and came all day.
Fucked 7 times in a day when I was 16...three different girls and while on vacation with my dad in the Bahamas. Came an 8th time jacking off when I finally went to bed (to sleep).

wow, when i saw this thread i was wondering if anyone was close to my record, also 16 times. and look at that, first reply.

I think its 4 ejaculations during one day. But my penis was a bit soar after that.
Some other other test I made was how quick I could cum. I started to furiously wank from soft to orgasm. It took me 54 seconds.
I dont recomend that - not the most pleasurable thing I done
But it was fun to try...