Although you can use either, there can be a slight difference in what is
emphaszed.
You have ten more minutes - emphasizes how much longer it will be.
You have ten minutes left - emphasizes how little time is left.
I can't wait for the work day to be over. Ugh. I have 30 more minutes.
You better hurry up on that essay. There are [only] 10 minutes left before
you have to hand it in.
6th June 2008
BarbaraPA
https://www.englishforums.com/English/10MinutesMinutesLeft/gvkvn/post.htm