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The Chandrasekhar limit is the maximum size of a white-dwarf, not a neutron star. It's usually defined as the minimum size of a neutron star (since it has to overcome electron-degeneracy pressure). The TOV limit[0] is the maximum size of a neutron star.

[0] https://en.wikipedia.org/wiki/Tolman%E2%80%93Oppenheimer%E2%...

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How much bigger can a neutron star be given the TOV limit vs. the Schwarzschild radius winking the whole thing into a black hole?

Ah yes - you’re right.

I was thinking of neutron stars all along - which, correct me if I’m wrong, look like they have similar density to an atomic nucleus and for which the upper limit is apparently 3 Sols. [0]

[0] https://en.m.wikipedia.org/wiki/Neutron_star#:~:text=Neutron....

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