動作 どうさ有効 ゆうこう期間 きかんでしょう
dōsayūkōkikandeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 動作有効期間

1. Probably effective period.; Likely duration of operation.

Polite
Presumptive
Conjecture
Computing