Editing a phrase

[thomasRavenelli]

the defence date shouldn't exceed the 8th week after the submission date .

I feel it is a weak phrase with many mistakes.Any hint?

[Anglika]

The defence date shouldn't exceed the 8th week after the submission date

As a sentence it is grammatically all right, but it makes no sense. Can you give context?

[thomasRavenelli]

I want to say that when i want to submit a thesis , the defence date is not allowed to be scheduled after 8 weeks of this submission date.

[aous02]

The deadline for submission is eight weeks from now.
You can improve the 2nd part of the sentence.