I have iTread set 1 and seet 8, both 60 minutes. I also have iCycle 9, but I haven't tried that one out yet. I LOVE the iTreads. They're fantastic, time flies, and you get it all.....hills, intervals, tempo, motivation!
Set 1 includes some walking (like 2 times for short interval), even for the joggers and runners; and it has a 10% hill on one of those walks! YIKES! LOL. Set 8 is great too, and I use this one with the runners' numbers when I want to hit at least 6 miles of distance. I recommend either of them!
Gayle