Time to reboot the host and power-up the VM. Usually the time to pause the guest (ie halt it and dump memory to the disk) and resume exceeds standard shutdown/

Time to reboot the host and power-up the VM. Usually the time to pause the guest (ie halt it and dump memory to the disk) and resume exceeds standard shutdown/startup times. Though in this case I think they treat a router OS update as a firmware. I didn't saw a Linux based OS on a hardware for a long time, but at least in VMs current distros start up pretty fast, while *BSD based VMs take a little more time to init, though everything start in less than a minute.