My problem with really long runs is that I get bored. About half marathon distance is as far as I go these days, maybe up to 15 miles. I doubt I'll do any more marathons simply because of the amount of time they take up to train for.
Anyhoo ... a slow 4.53 miles today, just a plod with the hrm for company. I don't usually run two days consecutively but I wanted to get one today so it's row tomorrow, run Friday, row or rest Saturday and then a 10-mile race on Sunday.
Well, after a couple of days off with a grumbly knee I was out again today, and it was fine. 7.12 miles including about 10K at a steady pace. A bit breezy after Storm Imogen but otherwise not unpleasant.