Nor even 3 mounts.
I generally just keep on mounting for about 12 times. Take note of the lowest temperature reported over those 12 mounts, and then keep mounting until I reproduce that value, or at least within 0.2C of it, twice more. If I don't see anything better then, then that's pretty much where I'm confident that I've seen what the block can do.
Anything less than the best (or very close to it) mount, is only just measuring mounting variations and not what a block is capable of.
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