I do not understand why a 10 minutes de is wrong, and a 10 mins de is right. I have not yet seen the latter given as an example.
Did you write a or à? Perhaps this is the simple explanation? Otherwise, suggest you file an error report.
Which Kwiz question are you referring to so that I can check that both 'minutes' and the abbreviation 'mins' are accepted ?
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Test your French to the CEFR standard