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I've not paid for the emoticons or whatnot, but I have bought extra time for a hand a few times. Sometimes you need a second to rethink how the action went down and make a better decision. The amount is also dependent on the stakes, I have been paying $.40 on the tables I sit at for extra time.
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I think you've thought a lot... seriously, in my case I've paid up to $0.3, that is, the more time you spend, the more you pay... a high roller's time shouldn't be more expensive

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The lobby is already looking good:
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