[brianogilvie]

My thought is that this approach would collapse like a row of dominoes after the first emergency occurred that kept you from working on a task in the block of time you assigned. You'd either have to move everything forward or shuffle around your blocks of time. It's contrary to the spirit of GTD to put anything on your calendar that doesn't have to be done at a specific time or on a specific date, for the very reason I mention: you don't want to have to constantly move tasks from one date to the next if you fail to do them when you plan to do them.