A few weeks ago I heard of a young ultrarunner guy who first spent 46 days running 4000 kilometers from Perth to Sydney for charity, and then was planning (just completed I think) doing a 1000 mile (1610) run in ten days, with the unique conditions of it all being on a 400 meter athletics track. For those counting, that is over 4025 laps in total, over 400 a day. He raised $1.4M for homelessness on the first run, and so far $1.8 million on the second one.