The problem is when it takes way too long. Coinexchange.io has shut all communication so there's no way to follow up or get an update... which btw is a very shady practice.
of all the exchanges that closed due to suspicious hacks or whatever, Coinexchange did it in a probable fairway. they announced the closure several months in advance so everyone had enough time to withdraw coins from there. there were also no additional complications during the withdrawal process.
and this last call for withdrawals is also a good manner, so everyone got another chance. I don't know how long they would have to keep all the services active to keep everyone happy.
Just my opinion about their case.
Almost 2 months later, still waiting for PAC. Is anyone out there still waiting for funds?
I don't know how much worth your PAC assets there, as far as I know, they have announced a slightly higher fee for latecomers withdrawal. You may not have enough to cover everything.