It is either:
1) J'ai dix minutes de retard. I have 10 minutes of delay.
2) Je suis en retard de dix minutes. I am in delay of 10 minutes.
Please note that the English translations are only meant as a mnemonic and not real translations.
In French, you either "have xx minutes of delay" or "you are in delay of xx minutes."
-- Chris (not a native speaker).
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