Not having a deadline to approve/reject is not much different than allowing detention without trial. It flips everything over.
In the case of guns, it means that if the agency doing the check is not convinced that the potential gun buyer isn’t a good guy (rather than found to be a bad guy), then you simply put an indefinite hold on the purchase (and future purchase attempts). No need to have to document what would effectively be a rejection.
Similar to holding people without trial. The pigs think you did it, maybe based on “gut feel” but without evidence they can’t charge you, and they’ll certainly lose at trial. So they effectively ‘convict’ you by simply ‘forgetting’ about you while you’re in jail.
So, sorry Dems, gun rights may be the ONLY ISSUE these days that Republicans are significantly different than Dems, but the Reps are more or less holding their ground.
Somehow they can do INSTANT background checks for Do Not Fly lists and Security Clearances, but with guns the computers seem to magically slow down.