The maximum setting on this air conditioner is 30 degrees.
Please don't turn the volume up to the max.
to the max; at most
Colloquial adverbial use meaning 'at most' or 'to the fullest extent'. Often used in casual speech to emphasize a limit or extreme degree.
This job will take a week at most.
Only 10 people came today, at most.
I turned the volume up to the max.
My energy is at its max today.
I gave it everything, all the way to the max.