ok so totally only matters what your partner thinks is ideal. (well kinda, you matter too, but its thier vagina)
I also had this question a while back, except mine was concerning multiple orgasms. I thought 5-6 times was normal for a guy.
umm.. found out... nope. its not really.
in fact unless ive been miss informed, most guys only climax once and thats it. unless i suppose it is a special occasion.
anyway back to the topic, 1-2 hours is great if that is the kind of lover you have.
and there are SOME girls that are into that much if not more, ( I have had some very tired days
but honestly these girls make up an increadibly small percentage, so you should be fine.