The context of the following conversation is Taylor lost track of time, not realizing that she had been playing pinball for hours.:
Taylor says Whew, what a game.  That was a good one..
The friend responds Do you realize how long you have been playing?.
Taylor responds No, not really. Time fly's when you are having fun..
The friend responds Well, you must be having a lot of fun.  You have been at it for hours..
Taylor responds Oh my, really?  It doesn't feel like it at all..
The friend responds Yes, Taylor you have been playing pinball for two hours..