a possible way to get 7 days per level:
mon 8 am lessons (radicals)
mon noon 1st review
mon 8pm 2nd review
tue 8pm 3rd review
thu 8pm 4th review/guru
thu 8pm lessons (second bunch of kanji)
thu midnight 1st review
fri 8am 2nd review
sat 8am 3rd review
mon 8am 4th review/guru/level-up/new lessons
(the lessons marked are the radicals and the second bunch of kanji, you of course have to fit in the first set of kanji and the vocab too)
with that plan youâd still have 8 hours rest overnight from thursday to friday, so it shouldnât impact most peopleâs sleep schedule too much.
in theory you can go 4 hours faster per level, but then youâd have level-up and new lessons at 4am on monday (with that plan), which is problematic for most people. if you want to attempt going that fast, i recommend reading this MegaZeroXâs post.
personally iâm quite happy with just doing my lessons in the morning and aiming for 8-day levels ^^