I turn it off when I go to bed.
I turn it off when I leave the house.
I turn it off when I'm sure I'm not using it for a longer period of time (this applies to other reasons like reading a book, listening to music, conversation with my wife, ...)

I turn it on when I intend to use it.

Those hours when turned off count in currency units not spent.


Desktop; i7-2600k, 8 GB mem., Win 10 Pro, BIAB 2017; RB 2017 - latest build
Laptop: i5-2410M, 4 GB mem, Win 10 Pro, BIAB 2017; RB 2017 - latest build