There's no wait after shots to get spayed or neutered. There is a wait to get on the schedule though, they are usaully so booked up it takes a few weeks.
If he had the shots at boulevard, they should have scheduled you for the neuter. If the shots weren't there, they will need a copy. I'm not sure what the wait time is, but you can always call and see.
Shouldn't have to wait
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