Clutch wear isn't so much a factor of mileage as of the number of gear changes. If you do lots of stop/start driving (as sounds the case if you're doing pizza deliveries) then you'll wear the clutch out faster than if you do lots of highway cruising.
Also, driving technique is important. Do you ride the clutch when waiting on hills or traffic lights? Do you drive in hilly areas wear you work through the gears a lot?
You can burn a clutch out in 1000 miles of hard driving. I've had one last 100,000km. It's about the driving, not the mileage.
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