YMMV based on distro. IIRC OpenSUSE has upgrade “pathing” to reduce conflicts during long delays between updates. Geckolinux has an iso released 6 months ago and it will update to the latest OpenSUSE packages.
I honestly think Arch could handle 3 months as well as long as you update the keyring and read the update news from Arch.
NixOS rolling wouldn’t give a damn but that’s not really fair since it basically rebuilds the whole system :P
The biggest issue is not getting security updates for 3 months.