noun
short period of time; brief span
A somewhat formal or written-style noun meaning a short duration. Often used in contexts like 短時日のうちに (in a short time) or 短時日で (in a brief period).
短時日のうちに状況が大きく変わった。
The situation changed dramatically in a short period of time.
この問題は短時日で解決できるものではない。
This problem cannot be solved in a short time.
Often used as a prefix (e.g., 短期集中) or in compounds. 短時日 is a standalone noun.
Compound of 短 (short) + 時日 (time, days). The exact historical derivation is uncertain, but the meaning is transparent from its components.