Poker room comp system - how to keep track of played hours?

[AlienBoy]

In Los Angeles, players have cards, and once an hour a girl comes by and swipes the cards.

At some casinos I've seen that have comp cards, and you give your card to the brush who swipes you in, then you swipe out when you're done playing.

I like the latter system as a player, as you get your full time counted.

Also, I'd think it's cheaper to implement as a small room.


AB