Quackerjack is still in St. Canard, only 700 years in the past.
6 seconds sound clip from Darkwing Duck - Quack of Ages (S1E51).
You can hear this line at 00:02:32.882 in the DVD version of the TV Series.
Quote context
[...]
- Is it my fault no one will buy my toys? All anyone wants are yo-yos.
- If I can't destroy all the yo-yos, I'll destroy just one. The first yo-yo.
- That's funny, according to this thing, he's still there.
- DW, why are we borrowing the SHUSH time machine?
- Because, Launchpad, that was no ordinary top.
- Quackerjack is still in St. Canard, only 700 years in the past.
- We're going back in time, Launchpad.
- In time to stop Quackerjack from destroying the first yo-yo and altering the course of toy history.
- Set time coordinates for the year 1291. And don't mess up.
- According to this almanac, that's the year the yo-yo was invented. By the king of medieval Canardia.
[...]