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by citricsquid 4632 days ago
An exchange will allow you to trade instantly; the moment your sell/buy orders go through, the btc/usd is available in your account for usage, however getting USD into the exchanges can take some time and in the case of mtgox, getting USD out is almost impossible (it's why the price at mtgox is about 10% higher than elsewhere). Your location matters most, if you're in Europe you could get money into Bitstamp within a couple of hours if you pay for a fast transfer and once it's in you can trade instantly.