User blog comment:Planterobloon/Is BAN our strongest notation right now?/@comment-30754445-20180225212126/@comment-30754445-20180225213519

I don't know exactly how far it was analyzed, but suffice to say that the ordinal in question is beyond anything I'm currently comfortable at working with.

For what's it worth, the FGH equivalent of Level 250 is the scary-looking ordinal ψ(εK+1). This is precisely why I gave Psi Levels in my answer rather than FGH-levels. Because I doubt the average member here has any idea how big ψ(εK+1) is, but anyone can compare 180 to 250 and see there's quite a gap between those numbers.

At any rate, Strong Array Notation has been analyzed somewhat further beyond the point I've mentioned. But I don't think it gets to Level 260 (something called "stable ordinals" in the FGH).