Congrats. It depends on the location and the circumstances regarding moving up and how quickly. You might be able to move up quickly if the stars align and all the right pieces fall into place ie. if your location even has hourly positions in some other increments, someone moves either up or out and your manager likes your work. Some locations don't offer some of those smaller positions. We are fully staffed at 21 employees but we have a few 15's, 20's, 25's, 30's and 35's. We never had an 18 and some places have a 28.
So I said all that to say - there is no set answer but with the right set of circumstances you can move up. Also some places give their employees more hours than their position for business needs ie holiday time, someone needs the day off and there are no freelancers. So everything is fluid ;-)
and once again congrats ;-)