Are my AirPods Max discharging too quickly?

Hi, I received my AirPods Max last week and I think I am having some battery issues. The battery seems to drain pretty quickly even when my AirPods Max are in the SmartCase. How can I be sure they will go into low power mode?

I fully charged them about 18 hours ago. Since then, my AirPods Max have not left the SmartCase except for 30 minutes of listening to music. They are now at 57%. That doesn't seem right to me.