ESET Endpoint Antivirus 9.1.2057.0 along with ESET Management Agent 9.1.1298.0 has a rollover for the countdown to restart if the computer is sleeping or hibernating when zero is reached. This condition should be checked to prevent rollover and perhaps initiate a immediate restart if the timer has exceeded the time in the countdown to restart.
Example: I schedule the computer to restart after so many days or hours. I check the computer much later and see a alert from ESET Endpoint Antivirus says:
Device restart
Save your documents to ensure you don't lose your work, and restart you computer.
Your computer will restart in 1,158,050,440 days and 2 hours.