Great you're starting treatment again Christine.
I suspect the time frame will depend on who your orthodontist is dealing with and the speed with which they work. We usually have the first sets of aligners for new patients within four weeks, but sometimes it can be six weeks if they're very busy.
If you find yourself getting impatient, remind yourself that ortho treatment is about being patient and that this is a good way to learn about this process again.
Good luck and I hope you get them earlier than expected!