Thanks :p I do around 40 miles a week in just commuting so I'm not stranger to a bit of exercise. As for where I'll be riding the answer is probably on the roads, possibly some dirt tracks (nothing you'd call Mountain Biking though). I've found my range to be about 40 miles in a day at the moment (30 comfortably) so with any luck I'm hoping to up that to 70 miles. At the moment I'm also riding at 12.6mph average, but bearing in mind I'm on a heavier bike with no top gear that's pretty good imo :p
As you do...