Less than 10 minutes with Zerotime from wallet to Polo: it's fast, but not revolutionary. However I keep holding, because I think this one has the potential to go to at least 10M marketcap. Can't wait for the next weeks.
polo and bittrex doesnt use the new wallet. ( they dont accept zerotime payments at the time being ) if they would the transactions would take 5 seconds or so to confirm.
Also remember that exchanges usually don't update the balance in realtime because they have limited processing power and have to process deposits from many users at once along with other operations.