They are on their way out. Is it possible for a re infestation...anything is possible but assuming the bait was taken and passed around the nest...I would doubt it.
Like I said originally takes about 10-14 days to get em all and I think you are right around that mark.
Takes a while for all the worker ants to drink the coolaid. As long as queeny pooh was fed some the nest will collapse. Stragglers will show up for 2 weeks or so but disappear soon.
2004 Cedar Creek 34CTKS heavily customized
2006 Ford F350 FX4 Lariat Dually w/tow boss
1999 Lance 1110...cause it's easier for short trips.