Three hours for a reading test? He must have done something else besides reading. The longest reading test I can think of typically takes no more than an hour. Is it possible they did cognitive testing too? You should have signed a consent to test, that specified the nature of the assessments. Check to see what was on there besides academic achievement.
Make sure you request and receive all testing reports (not just scores; you should be getting narratives with a signature under them) before the meeting. For IEP meetings, you have a right to written eval reports 2 school days prior to the meeting.
