Valid period of conditional offer.

Hello,

I have a question for those who have been given a conditional offer. I would like to know if I am given a conditional offer to meet the minimum English proficiency score, how long will the offer be valid?

I have to admit that I applied to the programme quite late with the English score lower than required. Assume I receive their conditional offer, I would have very limited time to sit the tests.

Is the offer valid for the semester I applied for or I can postpone it to the next?

Thanks you.