Not all cranks are created equal. Temperature, humidity, residual fuel, crankshaft position, etc. all play into how long your car takes to start. Granted there should be no excessive delay while cranking but if it occasionally takes an extra revolution of the crankshaft or two to get fired up, I wouldn't work up a sweat over it. These are still mechanical devices and there will always be running variance when starting. Just how things work.
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