+1 giz
I attempt to do as little, or inconspicous, clock watching as I can. I try to be aware of the time frame for instances such as: I may have another appointment and it may take me x amount of time to freshen up and arrive at said apt.... I may have family obligations at a specific time... I may need to leave to make it to my RL job in time...etc. If I only have 30 or so mintues inbetween journeys, well, I may not be able to socialize as much as I'd like too. Otherwise, as long as I have some x-tra time, I don't mind chatting a little - as long as I don't feel like I'm being taken avantage of. So far, I have met very few gentlemen whom had openly taken this advantage, but for the most part, not many.
If the games begin at 10pm, and u show up at 10:05, then the game should end at 11:05pm, unless you make arrangements accordingly, or having a delightful conversation in which both parties are emersed in, etc. If you show up at 10pm - a lady takes 20 min to get ready - clock should start @ 10:20 and so forth.
I have however had a situation in which a client was an half hour late, unfortunately he wanted a full hour by the time we met up and I was unable to accomodate this because of prior arrangments. So he took the half hour instead, wasn't too happy about I assume, but by then, their was nothing I could do. Plans were already made, etc. I think the key is communication. Had I not already made other plans, I'd have gladly extended the time.