I would like to suggest if there's 4 cycles instead of 3. In gen 4, you have Dawn, Daylight, Evening, and Dusk introduced.
Example below:
1h Dawn, 1h Daylight, 1h Evening, 1h Dusk = 4hours (I prefer this one)
2h Dawn, 2h Daylight, 2h Evening, 2h Dusk = 8hours
3h Dawn, 3h Daylight, 3h...