Yeah, I think it would be a great fit. Cats sleep for 16+ hours a day and can be alone for 2 days as long as they have food, water, and clean litter boxes.

Note that you'll need 2 litter boxes, as there should be n + 1 litter boxes where n is the number of cats. Two cats would be better (most cats like having a buddy) but a single, older cat is totally fine! Just be sure to hang out with them.

I don't know about your humane society, but mine just lets you make appointments to see the cats, you don't have to commit to adoption and they're not pushy about it. You can just cuddle and play with some kitties if you want.