Calculator on the front page should say. It depends on the currency pair, but sending from the US is usually as fast as any other ACH transfer, between instant and overnight for me.
oh, ok; most interesting. that means it's a solution then, well, aside from things like (a) privacy concerns and the associated (b) ability for them to arbitrarily censor, delay, hold etc transactions which we have certainly see e.g. paypal do.