You should get longer, I'm using Performance Century Shorts and they seem to last. You can't account for holes due to wrecking, but otherwise they should hold up.
I also machine wash, and hang dry, but i NEVER put my gloves or anything else with velcro in with them, and I don't wash them with jeans or anything abrasive. I basically just wash my cycling cloths in a small load, AS SOON AS I get home. This seems to work for me, and my cloths are not falling apart.
(8 months is probably only 30-35 uses by your description, I've never tracked it, but I would figure 2-3 years or 100-150 "uses")
I also machine wash, and hang dry, but i NEVER put my gloves or anything else with velcro in with them, and I don't wash them with jeans or anything abrasive. I basically just wash my cycling cloths in a small load, AS SOON AS I get home. This seems to work for me, and my cloths are not falling apart.
(8 months is probably only 30-35 uses by your description, I've never tracked it, but I would figure 2-3 years or 100-150 "uses")