What Duolingo score do you need for Staffordshire University?

The page gives a 2-year validity for the Duolingo English Test. Some courses have higher entry criteria for accreditation or because they need exceptional communication skills, and these are on the course page's entry requirements.

For comparison, the same page says most courses need IELTS Academic 6.0 with at least 5.5 in each skill, and that it does not accept IELTS Online.

Staffordshire also accepts country-specific English qualifications, though these may not be accepted for courses above the CEFR B2 level.

Requirements vary by programme and change between admissions cycles. The score that binds you is the one on your Staffordshire programme page and in your offer letter, so check it there before you book a test.