Running

20 miles was the furthest I did. We had a pro coach give a marathon training talk at my running club and he advises all the runners he coaches not to run for more than 3hrs as the longest run, even if the full marathon may take them 5. As running for more than that takes too much out of you and it takes too long to recover and any session you do after that will not be as of good quality.
Have to say I didn't take this bit of advice as 20m took me 3:17.

I tend not to run more than 2h30 in preparation, but my marathon times are usually around 3 hours or so. This year though, I've not run over 2hrs in training as I have found it harder to build up to good quality longer runs (and have not enjoyed running as much as i used to). I'm a bit worried with the Edinburgh marathon only 5 weeks away and I've not run over 2hrs.
However, this week, in anticipation of a weekend away cycling, I've run 35miles in three days and have another 20miles planned over the next 2. At the moment it's all about good quality stretching.