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This could possibly be achieved by a 3rd party plugin or 3rd party software as it is more of a niche feature.  You could easily script this yourself just make a program that detects keyboard + remote input and forces computer to sleep after 2 hours.  If you are not using [x] keep mediaportal on top, then a simple popup that occurs with 2 minutes to go can go on top of mediaportal.  You could probably do this in autohotkey.

 

For me I would say that this is too niche a feature.