In this case I would probably work out a half fee for the stat based on the fact the person is not getting paid for the stat. At the same time they are claiming the day on their taxes as a day of business but closed for the stat and are able to claim the costs for the day for the building as it still has to have minimum heat/cool, electricity, etc.

When parents are paid for the stat without working we should be afforded the same privilege hence charging parents for stats.