what's the farthest you've ever gone on the treadmill?

Ten miles.

In 2020 the Dipsea Race was cancelled for the first time since WWII, but in late summer they decided to hold a "virtual Dipsea" where you could record your time by running the course by yourself or 10 miles on a treadmill.

I was out of state, so I decided to see what running that far gerbil-style would feel like.

By the end, you're watching the miles tick off in hundredths and it's a fascinating bit of mental torture. This was made worse because it turned out the treadmill I was using automatically went into "cooldown mode" after an hour, but you could manually override it for 2 minutes at a time -- which I did, over and over, because I wanted that nice round number on the display.

It essentially turned the final stretch of my virtual race into a sort of lurching fartlek.

I once did 20 miles on the treadmill training for Boston, as I wanted to nail a set pace (this was pre Garmins). Our fitness center was under construction so the treadmill was alone in the basement directly facing a cement wall. I had no music or other stimulus and I swear that time f’d up my mind for a while!!!

Didn’t care for our cruise ship destination stop. Ran a 20 miler. Never again. 2 hour max. Probably 1 hr

I’m embarrassed to say, just 3 miles

This year alone I have done 5 x 42.2k, 1 x 56k, 1 x 67km on the treadmill.

Training for my first 100 miler but live northern Saskatchewan so winter running outside is very difficult.

I don't run on the treadmill much, but 2 days after a foot of snow left some poor traction and with the temperature below zero I did 20.8 miles once.

28 miles. Also did 26.2 miles once because I was signed up for a marathon, trained, & too dang broke to go. The furthest I did on land was 31.1, but it wasn't non-stop, it was at the inaugural Dean Karnazes Rock n roll ultra at the Arizona Rock n roll marathon. I think all those long runs I had to restart every hour because there was a limit in the gym, but otherwise zero breaks. I always did 0.0% grade (incline) back then, but if I was to be young, healthy & in-shape I think I'd go by the dictum to go at least 1% in the hopes I could actually match everything I did on a treadmill on the roads.

Farthest I've gone on a treadmill is +/- 2 feet.

Mix it up with some intervals at different paces and incline and it gets interesting. I would do 2 miles easy, 5 X (1 mile moderate with incline + 1 mile flat fast) with 1 mile easy recovery in between. Throw another 3 in there and you get an excellent workout for your 20. Fastest marathon I did came after several weeks of mostly treadmill training. Was working insane hours in banking back then and only had time to pop into the gym for 60-80min. Found all sorts of creative ways to destroy my legs and lungs on the Woodway.

These days I'll generally cap it at ~20 miles bc I'm working with a far inferior treadmill that the ones I had access to in college (top of the line machines with lots of shock absorption that I actually quite liked running on).

Did 17 with 6 x mile a few days ago when a huge storm came through. Would have preferred to be outside of course but I made it through. Go by effort on my intervals bc I really think the calibration is off on the old machine I was using. No matter. Music for the "ons" and podcast for the warm up, cool down, and recoveries.