What counts as a "missed day"?

[MasterEnki]

Ok what aobut if I get only 10 hours instead of 4? (Always above 8), but sometimes just not to my usual 15 hrs?

Does that count as a "missed day"?

I would count it as a day,

Though, I would do the next 5x days of 16 hours (instead of 15) to make up the 5 hour gap.

If you are at the end of a stage, I would squeeze them in.