Planned on going about 18K, but legs felt absolutely dead 5K in. So I decided to cut it short and detoured back towards home. Didn't want to have take the bus back if I died on the run, wearing a soggy facemask required on transit, that I keep in my hydration belt pouch in case of emergency. Heat and humidity was building fast as well. Felt better, after taking one of my 8oz water bottles at 6K, so made it to 13K in total.