It's EXTREMELY annoying. I can't fathom how someone at Microsoft thought that it would be a good idea to force updates on users, or give them deadlines for when they must update the system. Someone has lost their mind.
I still receive notification updates, and I try to leave my system unplugged from the power network at night. It seems that the system won't restart and update itself without being connected to the power outlet, I guess to prevent mid-update shutdowns that could brick the laptop... That helps for now.
As for the setting suggested by Nao, it seems to work so far, but I still get notifications to update the system before X date. So I will keep using all options, to ensure I can update the system manually.