Pixel users report battery drain issues after March update, and this could be the reason
(www.androidauthority.com)
Usually within 24 hours or so. Security updates, on the other hand, are released months before they are on regular Google Pixel releases as GrapheneOS doesn't adhere to the embargo period that other manufacturers agree to.
https://discuss.grapheneos.org/d/27068-grapheneos-security-preview-releases