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

[urko888_]

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a few places also put barcodes on cards and someone comes by to scan every player once every 30 or 60 minutes.

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This is the worst solution. For some reason or another I hate having to bust out the card every 30 min which is basically like announcing to the tourists, "I am a regular".

Set up a system where either your card is swiped as you first come into the room for the day then swiped as you leave.

If you want to be nitty about it, invest some cash into a swipe at each table so that the dealer swipes you as you come into and eventually leave a game.