You only need to TT 21 days from where you are now, although I do not recommend it at all. It's dangerous TT more then 1 day at a time because of villagers and plants and whatnot. Just ride it out day to day. What I did to get the upgrades faster was buy everything in the store everyday for like a week. You have to have spent 70,000 to get Gracie to show up, and then you need four of her approvals, which is easy once you get her once because when you complete her check the first time you TT back to 5:59am the SAME day and then wait for it to 6:00am and then she'll be there again.
