If I buy round maglev ticket + MTR, when is the latest I can use the return maglev back to airport?

Hi,
I personally have no idea but the question is important to me as I am in Shanghai for thirty hours. I see there is a 2015 question about this and the reply is that although the metro pass is just for 24 hours the maglev return is valid for 7 days.
Hope this helps!

Yes, you are right. The metro pass is just for 24 hours but the maglev return is valid for 7 days.