There are two ways that I know of. I have never done this, but there are numerous reports on here of people doing it.
1) Same-day Fast Passes. (Doesn't require a ticket) Buy a second Magic Band and link it to a second My Disney Experience
MDE account. No need to buy another ticket. You can use that for "same day" fast passes. (You can walk right up to the kiosk at park open and get 3 more Fast Passes that are available for that day).
2) 30 Days out. (Requires a ticket) If you have already have Magic Bands and have an annual pass, or no-expiration ticket with any days left or any unused ticket in one MDE account ..... you can ALWAYS reserve Fast Passes with that MDE account at 30 days out (whether you are going to the parks or not).
So, if you book a resort vacation via a NEW MDE account you'll get new Magic Bands, new tickets, etc. So you can book your FPs at 60 days out. Then you use your old MDE account to book three more FPs at 30 days out on the same days and you end up having 6 Fast Passes every day of your trip. You just need to have 2 Magic Bands per person and remember which rides are go with which band.
Heck .. if you knew friends or family that Had annual passes and let you borrow them .. you could probably stock up on magic bands and have an arm full of them and not wait in a single line for an entire week.
It's a neat loophole because it lets people do things they want to do anyway like:
- Get around the awful tiering system at Epcot and DHS
- Make Fast Passes at multiple parks on the same day (ahead of time)
- Make Fast Passes for the same ride twice in the same day.
To me .. both options are pretty shocking loopholes to the "spirit" of the Fast Pass system. I just don't understand how the technology isn't there that if a MB isn't scanned at the park entrance it shouldn't work inside for Fast Passes.
That being said, I will do it on my next trip if I do a resort stay. If the loophole is there, why not take advantage of it? What else are these extra Magic Bands good for?