I used to work 3PM-11PM weekdays. It was awesome. Now...not so much.
I do one of four things to get my fix now.
1. There is a terrible 6 hole course near my work, easy to pound out on my lunch (with a couple discs).
2. Just go to that course and work on putting and approaching on lunch.
3. Created my own pole (putter) course out back behind work. Good line work, not very long. 100-180'
4. Play classic target golf somewhere near work.
A little bit of lunch play is better than nothing. Believe me, it is not the same, but at least I get to make time to throw.