twice or thrice a day. i have seen problems happening if you wait more than week (signatures not matching and stuff). Also I have a mostly automated setup (essentially sudo password read from password manager into std input of sudo -S sh -c "yes | pacman -Syu ", yes command will update the packages.) since i manually trigger it, if i know i do not have internet or not in a situation to deal with it in case something goes wrong (last happened more than 2 years ago), then i do not. I also see the command’s output which lists all packages updated, so if there is something that requires reboot, i will reboot soon.
twice or thrice a day. i have seen problems happening if you wait more than week (signatures not matching and stuff). Also I have a mostly automated setup (essentially sudo password read from password manager into std input of sudo -S sh -c "yes | pacman -Syu ", yes command will update the packages.) since i manually trigger it, if i know i do not have internet or not in a situation to deal with it in case something goes wrong (last happened more than 2 years ago), then i do not. I also see the command’s output which lists all packages updated, so if there is something that requires reboot, i will reboot soon.