4-8 hour runs! I can't pretend to understand. I'd top out at ~3 hours at max marathon long run. I would love to do an ultra someday, but not sure if my knees ar

4-8 hour runs! I can't pretend to understand. I'd top out at ~3 hours at max marathon long run. I would love to do an ultra someday, but not sure if my knees are gonna let me. Take a few extra steps for me next time!