The default for Inactivity Timeout is Five hours, then can be extended to 16 hours. 16 hours is the max.
IS5045 STB
Menu > Settings > Display
Navigate down to Auto Standby, arrow right or left to desired time.
Navigate down to Save, press OK
Amino/Roku/FireTV
Guide > Back Button > Settings > Playback
Select desired Inactivity Timeout
Any questions, please call RTC Networks at (701) 862-3115.