The advantage of scheduling every hour is that you get to see exactly where the time goes. It might seem excessively restrictive, but you can schedule leisure and relaxation too, schedule yourself in such a way that you are not working during a certain hour. You could schedule an hour for listening to music. I'm going to start doing this beginning Monday morning, since I've felt a little unmoored since the semester ended. I've gotten a lot done, but I'd like to be even more savvy about my use of time.
This is not just about getting more done, but about freeing time to do other things that you might enjoy doing. Scheduling seems to restrict time, but it actually frees it up quite a bit and eliminates guilt about not always working. This technique will also help you do things you've been forgetting to do, exercise and meditation if you're anything like me.
Hour-long blocks are useful, because they make for handy units of measurement in which a significant amount of music-listening or house-cleaning can be done. Whenever practical and possible, try to do something for at least an hour and avoid multitasking as much as you can when you first start using this technique.