30,000 miles before I switched them.
I still have the tires and wheels. I have 2 tires with 8,000 miles and 2 with 30,000 miles.
I switched out due to a desire for more aggressive tires.
I'll probably sell them eventually, but haven't had the time to put something together yet.
The 30K would make for a good full size spare. There is some higher outside wear due to a non-landrover alignment, but plenty of tread. The other two are beauties with more than 30,000 miles left on them with equal wear.