Max Crits negated per round?

[Murdock Mudeater]

That other thread on crit range has me wondering. What's the max number of critical hits you could negate in a round? You know, like for a creature that not actually immune to those critical hits.

[Saethori]

An infinite number. Just so long as you make those Fortification rolls to negate them.

[David knott 242]

It depends on what ability you are using to negate crits. If there isn't a limit per round, there is usually some sort of daily limit.

[Vatras]

Most abilities that negate crits are immediate actions, so the number is typically one per character with such an ability per round.
Saethori's armor works all the time of course while your rolls are good :)