Time is only one factor used to determine a quicksell. If a hat sells within 1-2 days for its b/o in pure, one should be suspicious. However, since time to sell varies greatly among the type of hats (old vs new effects, misc vs hats, high tier vs low tier), this is not a reliable way to identify a quicksell.

"More important is how a sale relates to other sales. If a hat sells for less than commonly offered values in pure or unusuals or for less than common trade points, that is likely a quicksell."

In this case, the hat is not sold for less than commonly offered values in pure nor it is a lot less than common traded point, hard to call this a quicksale in my opinion.