Sheez, I have been to two Kingdom Halls in a little over a week. I just turned around in the parknig lots because they happened to be on convenient corners...does that count?
If you mean actually going in, it was a few weeks ago. I passed a message to my wife (who I had not seen all day) that I would be waiting in the parking lot to drive her home.
If you mean actually going in and staying...I don't even remember, but more than a year.
Respectfully,
AuldSoul