What i don't understand is that you know this is likely going to happen every time you turn on your computer, yet you don't go ahead and have windows check for updates to keep it from surprising you with a forced reboot.
I managed the WSUS where i work and because some people refused to install windows updates or reboot, i started forcing installs and reboots. though i set a date and time for the force to happen. Then i send out an email to let everyone know about it, usually a 5 days in advance. If they can't get it done or save their work by my set date, i just don't care. Sorry, i give notice, you can work around it. Plus i only do this once a month baring some sort of major update.
As others have said, either your computer is backlogged or possibly they're slowly pushing out a large group of updates. When you come into work, log in, and then go to control panel and run windows updates. Unless you check the option to check with Microsoft, it will only check it's assigned WSUS server. there you can see how many updates you have pending. With them being forced, you will get an error message if you click the install button because once you see that screen, if the force date has past, it's already installing in the back ground, thus it can't run that install. I wish it would just show you the progress, but it doesn't. however you can watch task manager or give it 5 minutes and have it check again and the number of updates will be less if it's still running.
As for your attempts at disabling the update service, you might get in trouble if you're discovered. messing with the system time may also get you in trouble as your work file time stamps are going to be off and may cause problems. If you get caught and cause your department to lose their local admin rights, you will not be a liked co-worker.