+1 on most of what Homeyba said.

I've been using Friel this year since I wanted to improve my 10-mile ITT time and break my PR in a metric century. But I also wanted to do weekend centuries to finally get over that "gulp, a CENTURY" feeling in the back of my mind.

Kinda hard to do that AND do the kinds of intervals, skills etc. workouts that a Friel schedule will entail, all in just ~10 hours/week!

So I've adjusted to a schedule similar to Homeyba's: 4 rides a week with a century on the weekend, 2 intervals days (TT & hills) and one other day of easy noodling.