never had sex either so im answering this based on my knowledge in biology. the sex itself doesn't last for hours, even half an hour is long. maybe a few minutes tops. it goes on for hours if you and your partner go for multiple rounds, especially since there's refractory period (its pretty short, around 10 to 15 minutes after climax). the bite marks and hickeys in manwhas are definitely an exaggeration, almost all of them. it's hard to give someone a hickey, though that also depends since a hickey is mostly similar to a bruise. some people bruise easily, some people don't. and no, bigger ≠ better. it'll hurt more. what feels good in sex is stimulation, that's why it's good to have a long foreplay before penetration. sex in general is very messy. VERY MESSY. and not as sexy as it looks in fiction. hope that cures your curiosity because i was once as curious as you are lol.
Unfortunately Manga sex is almost always way rougher and exaggerated then real irl sex. How long you go depends on the stamina of your male partner if your having hetero sex the longest penetrative sex I have ever experienced was like 30 min and the foreplay before was probably 20 but yeah hickeys take mad long and its hard to be in the right positions to get hickeys in multiple areas. But ya I wish I could experience Manga sex lol.

Never did it before so im rlly curious
Does sex rlly last hours?? Do people actually bite the other the way theres 15 million bite marks in manhwas?? Does bigger rlly feel better?? Where why and how??