Like how many days do i have to TT to see retail full of furniture on flea martket? (Ya This is my 2nd TOWN where i TT not my first so please dont judge)
If you want it faster, you should send them random unwanted furniture. They'll put up their old furniture they replaced with the one you sent them (or if you're lucky, sloppy or cardboard pieces from Cranky or Lazy villagers). I think this has about 70% success rate. The 20% is they don't put anything up for sale but occasionally trade/sell it to you in person. 10% is they voided it. Although the voided one only happens to me because my Re-Tail is full of my golden furniture.
It's really random. Good luck though! It's a good idea to put at least one item of yours for sale in the Re-Tail too. :3