Commuting by SS/FG

Am I alone in thinking an hour and a half commute by bike is a reasonable thing to do?

Nope!

I'm trying to decide whether 20miles each way from Bristol would be too much to do everyday.

Current commute is about 2miles each way :/

Well, when we moved house, I set my limit at 20 miles radius from work. I went from doing 3.5 miles each way to doing 19 miles each way. The first day was a bit of a shock to the system and I admit I did feel like crying for my mum, but by the end of the week I was fine. I was also convinced there was no way I was doing it long term on a fixed gear (due to the 30 mph headwinds that crop up), but due to our cycle2work scheme going down the pan, I've been forced to stay on fixed gear and it's all well so far (over 3 months I've been doing it, 5 days a week).