> So in that case, what about setting 10,000 permutations (the standard)
> and still targeting only one brain slice? The example would remain a
> bit complex regarding data masking but a copy-paste of the code would
> be correct. Also, the example would be faster, which is something
> appreciable. What do you think?

The mask makes the example hard to follow. Also, in nilearn, a run-time
of 2min is not a problem.

On my old box, 10,000 permutations with full brain takes 232s. On my new
box (that's 2 years old) is takes 150s. Let's go with 10,000
permutations, full brain.