Lots of variables affect tyre life. You mention wheel alignment, but also how the car is driven, where the car is driven, how accurately the pressures are maintained, and so on. Does the car do a lot of slow speed manoeuvring, for example where the wheel might be turned without the car moving? Lots of roundabouts? Harsh acceleration or braking?
Was it the more worn inner part of the tread that was down to the markers, or the less worn part? The tyre tread should meet the minimum thickness across 75% of the width, so if more than 25% of the width was excessively worn, the tyre would need to be replaced regardless of the condition of the tread outside of this worn area.
Loads of variables.
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