How many questions are on the MCITP exams?

Hi! I'm just starting to prepare for the MCITP Enterprise Administrator exams. Does anyone know how many (or average) questions there are for the following exams:
Exam 70-624
Exam 70-640
Exam 70-642
Exam 70-643
Exam 70-647
Thanks!
Exam 70-624
Exam 70-640
Exam 70-642
Exam 70-643
Exam 70-647
Thanks!