You were in there for an hour.

[Zoli]

The context is about someone who was in an office for an hour.
I was wondering what is the word "in" because I don't think it is a preposition in the phrase: "You were in there for an hour."

 

[5jj]

It's a preposition; its prepositional object is 'there (= "the office")'.

 

[emsr2d2]

The context is about someone who was in an office for an hour.
I was wondering what is the word "in" is because I don't think it is a preposition in the phrase no colon here "You were in there for an hour."

 

[Tdol]

Why do you think it's not a preposition?