windows hyper-v server restart problem

i was installing updates to our 2 windows 2012 r2 virtual servers, and had completely closed down our exchange 2016 server (hyperv), i then ran the updates on our domain controller, and ran the update and close down option.

i then moved on to the hyperv server itself and chose the update and restart option.

unfortunately, i did not verify that the update and close down had finished on our domain controller.

we now have the hyperv host “shutting down service: hyper-v virtual machine management, and it has been doing this for the past 45 mins.

the drive lights flicker every 10 seconds or so for a second or two, but it does not seem to be doing a great deal.

in addition i paused (rather than cancelling) our barracuda yosemite backup which was running prior to the restart.

my question is, can i just power cycle the server, or just wait? how long is reasonable to wait? will it ever complete, or is it hung somehow.

this is a production server and users are wIting to get back on it.

any advice appreciated.

many thanks