Time is only one factor in deciding whether or not a sale is an outlier. Should no other sales have happened or lower sellers have popped up, I'd have agreed. However, there's a new sale at 18 that took longer, and a seller at 21 seems to be unsuccessful so far. This means either the market has changed, or it could be an indication that 19 selling fast was just lucky. Given the circumstances I think a changing market is more likely the case.