From what I can tell, they should have a month or two before they start getting significant health issues. These snakes are actually the first I've ever seen with mites in person, aside from all the youtube videos. Both look like they are still at a healthy weight, but neither is happy
They only have one water bowl that is too small for them to soak in. Mites are crawling around or stationary on several parts of them, with a couple going in and out of the heat pits and eyes. The mites don't look like a carpet yet, but maybe there are more that are hiding from view. I wasn't able to take them out and handle them.
The only issue is, I live 5 hours away from this petsmart. I can only hope they took my suggestions and that they will put them back in quarantine and scrub out the enclosure they had them in. I don't know what their procedure is for mite removal, but they already did it once so it must not be very comprehensive.
I am in the area for a couple more days and we may stop back again for an update