Open the XFCE Power Manager and go to Display. General> System > Display and where it says "put to sleep" drag the bar with your mouse as far as it will go to increase the time.
I looked in my Xfce Power Manager settings and couldn't find any other way to change the sleep settings. Maybe give another DE a try and see if there are more options to control the sleep settings.
Quote:
All ac settings are set to NEVER, but it still goes to sleep on ac.
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Sounds like a bug to me:-