it will take 303 confirms to polo, about half way it will show up in the deposit page on polo as pending.
How long does it take to transfer lisk?
It's been 20 minutes and it doesn't show yet, and it's not also on block explorer.
it needs 303 confirmations (~52 minutes). and 70 confirmations to be visable at polonix account
Why it needs so many confirmations? It's something like "default" or?
Poloniex set up such a long delay just in case. If you remember when Ethereum was added to exchange there were like 3-4 hours for confirmation and after a couple of weeks they switch such hard rules off and now you can send it within 10 minutes. I guess the same will be with Lisk, when polo will be sure that the blockchain is ok, no fraud or other shit. And they will reduce number of confirmations to 101 (~15 minutes). You should always know that such rules are only benefit the security of whole blockchain to restrict it abuse.