12 hours?
I hope you mean 1/2 hour!
I've never heard of a patch that took 12 hours to apply ...
D
"12 hours?
It takes a lot of time to take a full backup of the machine, especially if the tape drives are busy. Then there's a patch and a reboot. It takes a Solaris box with lots of memory and disk a long time to reboot. Then there's system and user testing.
So the actual patch doesn't take that long, it's all the other stuff.