dnsrowe,
Yes, it does take time, usually 1 to 3 days. You should be notified by e-mail when you do get credit. If you do not getting credit after 3 days, I would advise opening a support ticket. Those guys in support are great at tracking down your money. The more details you can provide, (where, when, what, etc.) the quicker support can track down your money.
All the best.