This extension makes it easy to temporarily disable power management on Chrome OS.
It adds an icon in the upper-right corner of the browser that can be clicked to switch between modes where the screen is kept on (sun icon), the system is prevented from sleeping (sunset), or power-saving settings are left unchanged (moon).
Be sure to Pin π the extension to your search bar.
Remember to turn the sun back to the moon at the end of the day to shut Chrome OS down.