B1
The maximum amount of something is the largest amount that is allowed or possible.
Dictionary examples:
My brother's maximum attention span for homework is about three minutes. (0.0)
The maximum number of times I can hit snooze is always 'one more time'. (0.0)
The maximum volume on my grandma's TV is always set to 'wake the neighbors'. (0.0)
maximum speed/effort/temperature (24.8)
The bomb was designed to cause the maximum amount of damage. (33.6)