For me it's not about trusting the hotpatching; I know it can work. What I don't trust is my own ability to not only do it properly but also to do it in less time than it takes to carefully close all my programs, reboot and then get them all started again. And so, reboot.

And to save making another comment elsewhere: About a week. It would have been longer, but I was having a configuration issue and a reboot seemed like a good idea at the time.