Battery Life
Why has my MacBook Air 2020's battery longevity started reducing quickly?
MacBook Air 13″, macOS 11.3
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It depends on how it is being used. 20 Tabs open in Browser, several intensive Application open etc. If just using maybe one for two Applications at the same time - Open Activity Monitor resides in Other Folder in Launchpad. Once Open >> View >> View ALL processes and check the CPU tab - looking for runaway process using abnormal amount of CPU - and have a look in the Memory tab for unusually large amount of Memory usage. You might have a process or application not functions properly.