Due to two things:
- The fact that our washer and dryer are actually out in our garage.
And,
- We live in a very hot and humid area, which accelerates mold and mildew.
We just don't start loads that will be unattended, even for a few hours. Because laundry left in the washer for even as little as an additional 45 minutes will need, at a minimum, to be rewashed, or possibly even just completely thrown out, as our clothes would have begun to get very mildewed indeed.