There are some people who were waiting more than a week for the answer. But eventually they come back.
The solution for your problem is choosing more recent exchange where they don't have problem with too many clients
Just like the earlier poster has rightly suggested, more recent exchange sites might not be the solution because of the fact that they have not been sell tested and therefore cannot be fully trusted. I would have suggested the medium size exchange sites that have stand the test of time, but those ones too are gradually sliding into the episode of taking forever to answer tickets but for the fact that answers will come is enough to be sure that your fund is secure as that is the most worrying part as against when ticket will be answered. And most times too, the challenges being faced are due to impatience of not reading the FAQ or not following the procedures and the likes so the customer care representative on the other end would just ignore and attend to more pressing issues.