I just searched for the asahi linux (Linux for M Series Macs) battery life, and found this blog post [0].

> During active development with virtual machines running, a few calls, and an external keyboard and mouse attached, my laptop running Asahi Linux lasts about 5 hours before the battery drops to 10%. Under the same usage, macOS lasts a little more than 6.5 hours. Asahi Linux reports my battery health at 94%.

[0] https://blog.thecurlybraces.com/2024/10/running-fedora-asahi...