I've found that real life just doesn't work in nice blocks. I'll ride, ride more, take a break, ride a lot, ride a little, go easy, etc.

Whatever life and my legs dictate. The problem with scheduling blocks occurs when you're halfway through the second week and feeling destroyed. Going to keep pushing through for another week and a half until the "scheduled" break? Same thing the other way. Get to the end of week 3 and feel awesome with great weather and lots of time available next week. Going to take your scheduled break, then?

Your body doesn't really know 3 weeks on, 1 week off. Your body only knows the recent stimulus it's undergone. Whether or not you're properly recovering from that and can push on or back off comes with a bit of experimenting and experience.