No, of course it's not acceptable, it's as if you do a job for 1 or 2 months and when you go to get paid you are asked to wait 3 months, that's absurd, more than the time it took you to get paid? those campaigns and ICOs should be denounced, they won't be scams but they are close enough, and when they release the capable payment and the token has no value, leaving you with another currency unused in the wallet.