Hello, teachers!

Are these sentences correct? I think 1-1, 2-1, 2-2 are correct, but the rest aren't. Am I right? [Sorry for a twin-topic question, but the 1-3 & 2-3 are just for confirmation. Beware of a two-head monster! ]

[within]
1-1. You have to return this book within two weeks.
1-2. You have to return this book within two weeks' time.
1-3. You have to return this book within two-week time.

[in]
2-1. You have to return this book in two weeks.
2-2. You have to return this book in two weeks' time.
2-3. You have to return this book in two-week time.

Thank you very much.
Best Regards.

As you suspect, all of the sentences are correct except for #s 1-3 and 2-3.

There's another version:

"” You have to return this book within a two-week period

It's somewhat redundant, but you can also say

"” You have to return this book within a two-week time period/period of time

These variants work with the preposition "within" but not with "in."

Marilyn