I am not an ADC trapper, I'm a fur trapper.  I did some summertime ADC work for an ADC company about 15 years ago, but none in the winter.  So I have an idea of ADC techniques, but have not dealt with a winter house skunk infestation before.
Eight days ago I got a call from an exasperated property manager. There is a skunk problem in a home she manages.  It's in town, 200 years old, and has 3 apartments.  Skunk odor and noise under the floor.  There is a cellar in the house, with some crawl space.
The only ADC trapper in this area was recently arrested on felony charges for stealing from a customer.  There is no others within an hour.  I reluctantly agreed to help her out since it is not too far out of my way.
I checked in the cellar and there was skunk foot prints everywhere.  One had sprayed directly under the floorboard of an apartment.  Right there I found an small entry way where they had pushed a brick or two of the foundation out of the way as an entry point.  It is a tight area in a recessed corner.
So I set up a 110 mag right at the entry point and blocked it off.  Despite cold temps I have caught 6 skunks in 7 days.  Only the coldest night with snow did I not catch any.
The first one I caught was a male coming out.  The rest have been going in.  Altogether 4 males, 1 female, and one unknown (the only one that sprayed).  I can not be sure that there are no other entry points, but I could not find any.
I have read that only females den together....is that true?  Is there likely a female in heat holed up in there?  I have looked at exclusions but this is such a tight area it would be difficult to attach without damaging the house and I have no experience with that anyway.
How long should I keep the trap up with no activity before I give her the green light to go ahead with repair?
Thanks in advance for any insight.