noun
short time; brief period
Refers to a short duration or a small number of days. Often used in set phrases like 短日間 (a few days) or in contrast with 長日 (long period).
短日の滞在でしたが、とても楽しかったです。
It was a short stay, but I had a great time.
この仕事は短日で終わる予定です。
This work is scheduled to be finished in a few days.