When I had cats years (decades) ago, they were fine when we left them for a few days with a big bowl food. Of course, they were all outside farm cats, and the ones who were allowed inside were put outside for those times and had a barn to retreat to. They all likely augmented their chow with mice and birds. If we were gone for more than a couple of days, a neighbor would come over and feed them.

Keeping cats inside for a couple of days would worry me because they might get destructive and resentful--and ruin something. But if they are let out or have a cat door, I bet they would be just fine.