Give 15 minutes of grace, then charge a $25 late fee, and put that line in the confirmation text so nobody is surprised by it. In the episode Marcus waits on “five minutes away” until 45 minutes are gone and the foam has dried on the paint — a $180 leak. With the late fee stated up front, Fiona turns up 20 minutes late, pays the $25, and Marcus still makes his 2 PM. The fee is not really about the money: it is what stops the waiting.

S2E6 · “Five Minutes Away” · 45 sec
Customer of the Week: Five-Minute Fiona. The foam is already on the car when she texts “almost there!!” Marcus says “no rush”, and she is still in line somewhere. Forty-five minutes later the foam has dried and the day is behind. DIAL puts one line in the confirmation text instead.
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Heads up: 15 min grace. Then a $25 late fee.
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