does it vary for different coins? I'm asking because if I want to day trade I want to make sure its doable. Someone told me it takes a long time to have a buy go through and a sell.
Well, i dont understand what are you trying to say. Do you mean to make the order taken in the market or just put sell or buy limit?
If you mean is amking your order taken in the market it is depending in the market run. Fast run is faster filled. But if buy or sell with recent price, you order will be filled in just few seconds.
But if you mean just put the sell or buy order, it is just take a minutes.