
Im Internet finde ich dies hier:
The store upgrades are the same as in Animal Crossing: City Folk:
1) To obtain Nook 'n' Go:
...a. 30,000 bells in transactions at Nook's Cranny, and
...b. Nook's Cranny must be open for a minimum of eight days
2) To obtain Nookway:
...a. 80,000 bells in transactions at Nook 'n' Go, and
...b. Nook 'n' Go must be open for a minimum of 15 days
3) To obtain Nookington's:
...a. 150,000 bells in transactions at Nookway, and
...b. Nookway must be open for a minimum of 22 days
4) Unlike prior versions of the game, Nookington's does not require having a
player from another town make a transaction at your store.
5) Just as in prior versions, both buying and selling at Nook's counts toward
the transaction thresholds.
6) Just as in prior versions, paying your mortgage has nothing to do with store
upgrades.
7) Just as in prior versions, Nook will not upgrade on a holiday.
Nook's Cranny is open from 8am to 10pm.
Nook 'n' Go is open from 7am to 1am.
Nookway is open from 8am to 10pm.
Nookington's is open from 9am to 9pm.
One month after you obtain Nookington's, as you are exiting the store, [Tom
Nook] Tanukichi will ask you about what you look for in your shopping
experience. The choice of response will allow you to change your store if you
desire:
...[Variety] Shinazoroe (keep Nookington's)
...[Balance] Baransu (switch to Nookway)
...[Good hours] Eigyoujikan (switch to Nook 'n' Go)
...[Nothing much] Betsuni...
Any change will happen a week later.
It is not yet known if you can regain Nookington's.