At most; indicates an upper bound or maximum (no more than the stated amount or degree).
参加者は多くとも50人だと思われる。
I think there will be at most 50 participants.
この仕事は多くとも二、三日で終わるでしょう。
This job should be finished in at most two or three days.
電車の所要時間は多くとも一時間半です。
The train journey takes at most an hour and a half.