A couple of weeks, maybe? I haven't been paying attention.
I have the luxury of blending in, but from what I've generally observed, the people here seem to be oblivious. For the most part. Not sure if it's a willful ignorance, or if there's actually some sort of thing that's blocking their brains from noticing all the bizarre things happening in their town.
For example, the skeletal dinosaur that's been spotted around.