We haven't been to the theatre for a long time.

2. It took three hours and a half.

It took three and a half hours .

3. I saw Jane the last Thursday.

I saw Jane last Thursday

4. They decided to stay in last evening.

They decided to stay in last night.("yesterday evening" is also possible but it doesn't sound so good.)

5. She usually watches the news in the night.

She usually watches the news at night.

6. How many time does it take?

How long does it take?

7. There's not many time.

There's not much time. OR There's not much time left (This sounds very natural).

8. We played tennis every Thursday of June.

We played tennis every Thursday in June.

9. The last Friday I left the office early.

Last Friday I left the office early.

10. I don't go there more frequently.

I don't go there very often.