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.
Bittrex, Polo, and many others haven't updated their wallets yet because Zerotime is not a hard fork and Zerotime wallet is currently 0.3.2 RC1 alpha.
Also, blocks are taking less than 2 minutes on average so Poloniex should confirm in 2 minutes on average and Bittrex should confirm in 4 minutes on average. They probably just updated at the most inopportune times. Poloniex only needs 1 confirmation. Bittrex needs 2. If you send a few more times, I think you'll see your VNL can get confirmed a lot faster even without Zerotime.