Maximum profit I have made: 733%
what coin: bitcoin
behind the success: steady hands, no panic sell, lots of research, buying in the dip ($180) when nobody was looking.
time: 2 years (?) maybe it was 3
how much: I recently sold a small amount to get some fiat that I needed, otherwise 733% profit is way too small to want to sell bitcoin!
Although this is directed to people with altcoin trading,
oops.
for altcoins the highest profit in one go for me is usually less than 20% because if the altcoin is on the rise, I sell after the rise (it is after the initial hour of the pump) and wait for the dip then buy again then sell again and rinse and repeat. it accumulates to a bigger percentage but you asked in one go