Turbo training programs for long distance events
Turbos are great for short interval work, brutal power workouts (cf. the comment above citing sufferfest.com) where you can monitor your output and heart rate more accurately. But they are dull, mind (and body) sappingly dull. 

I'd save the long workouts for the road, it's more interesting and you've got mates to chat to and spend time with. 

Use the turbo for working on the raw pace, short (60-90 minute) pieces with shorter, harder threshold pace intervals.