Surely the psych will have a preference? When we've done testing with our kids the psyhologists have told us how they work, the one that liked to split the testing up offered us appointments a week apart and that was that. One tester wanted to do things all in one day (just IQ, not full neuropsych). Both these two their approaches were sound for how they worked with the kids. We had one guy though, who schedule IQ and achievement all in one day, he told us he would give her a break and then didn't, because she said she was ok to keep going when he offered a break (duh, she's a super compliant girl with aspergers desperately trying to figure out "the right thing" and do that), and that clearly impacted her performance. She came out miserable and exaubsted and performed less well than she could have on some areas.
