以内に

within

→ 以内
phrase Rare #39,516
within Used with a period of time to indicate a deadline or time limit: “within [amount of time].”
JA: 明日以内にこの書類を提出してください。
EN: Please submit these documents within tomorrow.

私たちは一時間以内に到着します

We'll arrive within an hour.

三日以内にお返事いたします

I will reply within three days.

首相は数週間以内に辞任すると発表した

The prime minister announced that he would resign within a few weeks.