*to be taken as an indication, varies according to the models
one engine revolution corresponds to 3 ignitions.
If you have 5000 ignitions in range 1.
5000/3 = 1666tours (which were done between 7300 and 7500) So 1666/7500 = 0.22min = 13.2second
We multiply 0.22x60 to find 13.2s
This means that in total, the car has been on the breaker for 13.2 seconds since it was put into service
(for info 0.50min = 30s because 0.50x60s = 30s)
You can do this on all ranges