I summited Everest in May 2018. I have never run a marathon. I've always quoted ballpark PRs on LetsRun because I didn't want to be outed, but I don't really post enough to care anymore. I started posting in 2005 in high school and then frequently throughout college. I ran 1:57/4:00/15:29 on the track. I ran a half marathon in 1:14 before my senior cross country season in college during the summer. I'm pretty confident a 3 hour marathon would have been very achievable at that point in my life. I have never run the marathon nor has it really appealed to me. As I've gotten older, I've considered doing it with friends that are trying to qualify for Boston.
Harder is a very subjective term.
-Everest without Sherpa support above base camp is harder than running a 3 hour marathon. It involves doing your own gear carries to C1/C2/C3, getting a tent to camp 4, and stashing oxygen along the way. Very few people do this. My team paid to have our stuff sent to base camp via porters/yaks/helicopters. We did the bulk of our gear carries but did have Sherpa support for oxygen. If we had done all of the oxygen ourselves, it would have been another trip through the icefall. Doable, but wanted to avoid.
-At the far end of the spectrum, there are people who make an absolute joke of it. They have 3-4 Sherpa for every climbing client for logistics. The clients have a personalized sherpa AND a personalized western guide. These people carry no gear, melt no snow, set up no tents, and don't even tie their knots. I saw enough of it last year to make me want to quit climbing.
-Flow rates on oxygen matter, a lot. Last year the majority of the outfits on the mountain used a new oxygen system and the regulators got really messed up. Most westerners are ox 3-4l/min from C3-C4 and 5L/min from C4 to summit. I used oxygen about half the time between C3-C4 and climbed on 2L/min on summit day. We left a tank a with a Russian in very bad shape at C3 and I found that my regulator was less likely to act up on a lower flow rate. This make a HUGE difference. I feel confident I could have summited with out oxygen, but I would have had very bad frostbite.
-In terms of prep, I did Rainier, Ecuador volcanoes, Mexico volcanoes, and Denali before Everest. Between gear, permits, traveling, tipping guides etc I estimate I've spent $100k-$110k on climbing in 5 years. This, combined with the time off work, is one of the biggest hurdles to doing Everest.
-The training I did for Everest I would consider a similar level of intensity for what I would need to do for a 3 hour marathon. I ran twice a week, did a long weekend hike with a heavy pack, did stairs 1-2 a week, and was at the boxing gym 1-2x a week. I think I would need 40 miles a week of running to break 3 hours in the marathon. The training I did to run the 1500 in 4:00 was much harder than either.
I'm glad I did Everest and am proud that I could do the majority of it on my own. I would consider it much more impressive than a 3 hour marathon. I think my track times are better athletic accomplishments.
-