noun
daytime hours
Technical term used in contexts such as labor statistics, scheduling, or energy consumption to refer to the number of hours during the daytime.
この調査では、昼間時数と夜間時数を分けて集計している。
In this survey, daytime hours and nighttime hours are tallied separately.
Compound of 昼間 (daytime) + 時数 (number of hours). The exact historical derivation is uncertain; the spelling is conventionally associated with this meaning.