Good Question...
Fuel burn is:
0.3 at warm idle stationary, minimal load
0.4-0.6 at warm idle coasting, minimal load
0.5-0.8 at warm idle coasting, high electrical demand
Time spent. Hard to estimate. Mostly stopped anymore, but my 40+ tank last year was 2-5% EO (time) maybe
Now it's more like 1% of time.
RH77