B1
the largest amount allowed or possible
Dictionary examples:
My phone's battery has a maximum of 10 minutes when I really need it. (0.0)
The maximum of excuses I can make for being late is five. Then I just admit I'm lazy. (0.0)
The maximum of push-ups I can do is three. And that includes the one where I fall down. (0.0)
The school has a maximum of 30 students per class. (19.9)
The temperature will reach a maximum of 60°F today. (56.2)