This is the 5021st most frequent Russian word.
максимум
Maximum; the greatest amount or highest level.
Here, 'максимум' is used to express the upper time limit within which an action can be performed.
Я могу сделать это за максимум два часа.
I can do this in at most two hours.
In this sentence, 'максимум' signifies the maximum number of people present at the event, serving as an estimate or upper limit.
На вечеринке было максимум двадцать человек.
There were at most twenty people at the party.
'Максимум' in this context is used metaphorically to convey putting one's full effort or capacity into an endeavor.