AirPods Max are wireless Bluetooth over-ear headphones. They are Apple’s highest-end option in the AirPods lineup, sold alongside 1st gen / 2nd gen AirPods and mid-range AirPods Pro. The main benefits of the AirPods Max over the mid-range AirPods Pro are the over-ear design with larger speakers, inclusion of Apple’s Digital Crown, more color options, and longer battery life. https://en.wikipedia.org/wiki/AirPods_Max
According to Official Apple Support Center, https://support.apple.com/en-us/HT211886, if you charge your AirPods Max for 5 minutes, you get around 1.5 hours of listening time. AirPods Max deliver up to 20 hours of listening time, talk time, or movie playback on one charge which takes about 65 minutes.