My T and I do 2 hr sessions about 1-2 x a month.
They sre really amazing. I feel like we get likr 5 times as much done, and it lets me bring up really sensitive issues that i don't always feel we have time for in regular sessions.
Its amusing though because i brought it up two years ago and my T said "no, thats just not how i do things "then last year she says " what would you think about doing longer sessions sometimes?" Not sure what changed . Maybe she went to a conference or something.

There have been times that our marriage counselor has let our sessions go as long as 15 or 20 minutes over, and that has made a significant difference at times. I think it's hard to fit human emotions into a 45-50 minute window. MC seems to try to make the session end on a good note and not stop based on time if things are still tense/one of us (usually me!) is upset/in a bad place. It often makes him run late--which can be a bit annoying if he's, say 15 minutes late for us--but I feel it's an acceptable tradeoff because he gives us the extra time we need sometimes, too. (I have mouthed "sorry!" to his clients in the waiting room when leaving before).

But there were definitely times with both MC and T where I knew in advance that I wished I could have had more time. T is pretty strict on time boundaries--even if she doesn't seem to have someone right after me (like, there's no beep on her office phone indicating her next client had arrived and/or there was no one in the waiting room). But MC seems to fit it more to the situation. Pretty sure I'd be the same was as him if I were a T. Though, as T has mentioned before, MC has to apologize a lot to clients for being late.