Do they want you to have a psych eval or a neuropsych eval?
I've done a neuropsych eval for a baseline. It wasn't fun, especially when I saw the report...

...but I don't think the two are the same. The neuropsych eval was long and involved, they did a full workup of cognitive skills, problem solving, memory skills, IQ, etc. I believe it was about 6 hours long (it was a long time ago) I remember it took me most of the day to do!
Let us know how it turns out!