I can see 2hrs, and I have on multiple occasions. The main reason for me is bc I cant cum more than once in an hour, usually. Two hours give me enough time to rlax and recover enough for an enjoyable second cup. After 2hrs I agree with harpman, what the heck do you want to do hanging around their place that long.
More than 2hrs and i'm looking for a date and companionship and conversation.