Is the "client reboot" notification changed in SCCM 2012?
The old client would let you dismiss it for up to 7 days after being patched. The new one only has options to snooze for 1, 2 or 4 hours, but it doesn't say if you can snooze more

There has never been a "snooze counter". It has always been time based. That can be configured in the (default) client agent settings -> Computer Agent.