MMPDS has tables of fracture toughness for aluminum in chapter 3. It does not contain values for 2024-T3 (likely because fracture is not typically a failure mode for thin sheet), but the max values for K1c (first mode fracture, crack opening) for any alumimum alloy listed do not exceed 50 ksi root inches.
What are you trying to evaluate with this value?
Also - this is effectively a double post, please refrain from double posting per the forum policy.