For our operation -
Nav lights ON when it's dark. OK, if you leave them on all day, there's no problem other than shortening the bulb life.
Beacons ON just prior to engine start, and OFF after spool-down. This is advertising to the world that an engine or moving aircraft danger exists. Beacon is also ON during tow to indicate aircraft movement.
Strobes ON when entering the runway, OFF immediately upon exit (This includes any time that I'm crossing a runway). This is advertising to the world that 'I have the runway'. If, on approach, I see an aircraft at the holding point with strobe lights ON, I have only one reaction - Go Around!
Perhaps a little naively, I thought that this was universal.
Regards,
Old Smokey