"He ate there twice."

Translation: Li manĝis tie dufoje.

[coenny]

I reported but just want to make sure. Can you put dufoje in front?

Dufoje li manĝis tie.

[andrewgtreantos]

Why does "tie" not have accusative ending (tien)?

[johmue]

It's not a direction, is it.

[Jaerivus]

I think what the other person was trying to tell you was that the verb doesn't indicate any sort of motion (as with iri, veturi, veni, etc), therefore "tie" isn't some verbal destination, it's just a location where the manĝi happened.