1. What's your event?
2. What's your longest solo/single run?
Me: 800
Run: 23 miles (once in high school, once post college, both times just having fun enjoying the running of it...)
For an 800 meter runner, 23 miles is a good long run.
Still, I can't even imagine that extra 3+ to make a marathon.
I think some of us are just born more suited to the longer stuff.
As fit as I ever was...2 a days for 4 years, free weights twice a week...
I still can't imagine an Ironman.
If I was suited for it, I think it would have been a major endorphin buzzfest.