The most accurate modern ID is under Kernel-General . It tells you the exact UTC time the kernel loaded. This is your definitive "On" time. To find "Off" time, you look for the gap between the last log entry before a 6008 event.
: For very slow boot times (minutes instead of seconds), enabling features like Memory Context Restore in the BIOS can significantly reduce startup duration. PC On Off Time
: Windows uses a "hybrid" shutdown that saves some system info to a file to speed up the next boot. While faster, it can sometimes cause issues with drivers. You can disable this in Control Panel Power Options if you prefer a "clean" start every time. BIOS Settings The most accurate modern ID is under Kernel-General