I've found the hour/day target reasonable, as it allows for the day job, household tasks that can't be moved, and time for my family too.
The one thing I noticed, was that I took Friday off. I made up for it on the weekend, piling Friday's slot in the rest, but this may be a trend. Friday seems to be the one night where the whole week comes crashing down and I'm just bagged. Then Saturday morning I have loads more energy. We'll see, but I think it's a promising start. That whole journey of a thousand steps starts with one idea.