I'm bi (so wrong forum), but I love to have very long drawn-out sessions.
Individual bjs can take around 1h and I usually cum twice in a session, occasionally 3x and rarely 4. Going for that length of time does have the occasional problem of the head going numb from over-stimulation, but I can usually finish myself off if I think that's starting to be a problem. Being thick, teeth are also a perennial problem, so I prefer to find guys that identify themselves as dedicated suckers rather than random Joes. This comes with the added bonus that being big oral cock-whores tends to help them push through the achey-jaw barrier!
As someone mentioned giving up on fucking earlier, I'm not really into anal (and find I lose my erection from it after a while except in very rare cases) but will do it if the sucker is looking for it. I do find that meeting guys that identify themselves as oral bottoms means that this isn't usually a requirement.