Idk man, I think it depends what the weather is like, and whether or not your home is climate controlled.

If I forget my laundry for a mere 4 hours in summer, it gets mildewy (gets hot and humid and I don’t have central air, only window units, so they don’t always run), and needs to be entirely rewashed on the sanitary setting.

This is the case regardless how often I bleach/clean the machine, I think the house water supply is the problem, but regardless, when it’s hot, it can be panic inducing even if it’s your own. That extra time to re-run (sanitary is 1.5 hrs to the 45 min of a normal cycle) has fucked up my day several times.