I just have one female and each one's pups per tub, and I need to refill water bottles every day, even for the tubs with pups that are still nursing rather than drinking the water. Twelve days is way too long to leave them unsupervised. I gave up on vacations when I got horses - I can't even leave them alone for one night, without someone I have absolute trust in to feed, water and check in on them. Rats are living creatures, as well - regardless of whether they're food, they deserve the consideration of clean cages, ample food and water, and being regularly checked on. I just don't see any way to leave them for twelve days without someone checking in and doing maintenance at least every three days.
There's the snakes to consider, as well - if something went wrong with a thermostat or something like that, twelve days is a long, long time.
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