To help speed the process I would just list the lead guest for each reservation. Don’t even bother changing the address. All of that can be changed and added later, This will speed up the process.
The other thing to do is to maybe consider starting a few days early and walk a few of them, just so you are not trying all on one day,
For example, say you are going November 10 to 17. Instead of trying all on Dec 10th.l11 month.start on Dec 8t and book a few rooms that morning, the. Book a few more on the 9th, etc.
Then you can just move those forward the few days once you have secured all your rooms.