That... things during someones day was kinda rough but not bad enough to say it was a full bad day.
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If by "only 31 days" you mean "exactly 31 days", then 7. If by "only 31 days" you mean "not more than 31 days" then all of them.
36 days is not "late". 36 days is "absent".
The mean
It's better to stay away from months since they have differing numbers of days. Call that 7 weeks and 5 days.
30 calendar days is 30 days including weekdays, weekends and holidays.