I usually see store fees billed any time between the 1st and the 8th - it's never the same day, but usually within that first week. Last few months it's been the 3rd-4th and today's only the 2nd.
Sometimes eBay forgets to bill then the next month they bill you twice. Some weird system glitch.
I'd give it a week and if you don't see the charge you can either wait and you'll see it billed the next month or you can contact CS and ask them to bill you sooner. Either way, the system always catches up.