I wash with darks, regular cycle with warm water.

I never use the dryer. Plastic and elastic fibers don't last very long when you subject them to high heat of the dryer cycle. The stuff is synthetic, wicking, fast-drying material, so air drying is fast. Faster if you do the "roll in a dry towel and sit on them" routine before hanging out. Really no need to dry if you either have more than one kid and/or plan ahead.

I've had shorts last 20 and 30 years. If you don't crash, you can get decades out of your cycling wear. And with today's pricing, it's great when you can get years and years out of cycling apparel.