I don't want to do the maths. I spend a lot of my days waiting. Waiting bothers me. Gets right up my nose. If I worked out the percentage I suspect it would bother me a bit more.
To pass time, I build if SL is available.
When I don't have a project to take my attention, I get very bothered.
Right now, I wish I had a project as I am tired of being bothered.
I am thinking I might make an observatory. Not sure though as I am not up to the scripting for the telescope, up down and round.