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It usually takes just under one hour to complete the WISC-V proper, although 1.5 hours is typical when one includes time to settle in and for introductions.

Perhaps she had other assessments as well? Four hours is about standard for a psychoeducational eval, with the WISC and a comprehensive achievement battery (such as the WIAT-III, KTEA-3, or WJIV).

...pronounced like the long vowel and first letter of the alphabet...