200 mile week, wow, good for you.
My shortest possible commute would be a ~65 mile week, in the winter I push it toward 70-75 usually with errands scenic routes, etc... I am aiming for my 3rd straight 120 mile week (mostly a much more scenic route), and definitely feeling it, right now, on Wednesday, I gotta say. I have a rec ride coming up Saturday (45, 70, or 100 mile route, have to canvass my friends, but all 3 have a lot more climbing than I usually do). Curious to see how that goes.
Personally, for me, and I imagine for you, it's nice to have the time available to do that much bike commuting. Right now, if my body doesn't break down, my schedule (and my job's, and my kids') would permit 120 mile weeks the rest of May.