And if you go up to 28g your fighter instantly self-destructs... Who knows, we don't even know what the limiting factor is:
Is it the ECA or ICS running out of power (a la Star Trek SIF), so consumption is larger than energy generation and it's running on capacitors only?
Does some bolt shear off or enter it's plastic deformation range? (Then it wouldn't be time limited, either force is enough to break it or it just behaves elastically. Long-time wear from doing it too often is excluded.)
So if it's ECA or ICS then I guess it can go indefinately at up to 27g and above that endurance is limited by capacitors.