At the deli counter:
"Place your order now and it will be ready for you in 15-minutes."
No hyphen necessary!
If you use a descriptive phrase directly before a noun, then you need a hyphen:
The 15-minute movie was too short.
Compare these examples, with correct hyphens:
The 38-year-old was a copy editor.
The copy editor was 38 years old.
It took 25 minutes to go shopping.
The 25-minute shopping trip was fun.
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