Assuming your job is regular 9-5, the most efficient way would be to do lessons right after work so that you have enough time to do the 4 hour review before bed. Then do the 8 hour review before work when you get up. The next review will be the following morning (24 hours later), then two mornings later you’ll guru and you can do your next set of lessons after work.
The important thing for each level is to make sure to get the radicals and the second set of kanji (the ones the radicals unlock) right.
Hope that helps, but don’t stress too much about it!