The length of the upgrade class depends on the new release. For example, if the course has been restructured to adapt to the new release, the class could take up to two days. If the course has just been enhanced, it could take only one day. In any case, you will not have to go through the entire certification process again. Instructors will help you decide your readiness for the exams.
Students pay for their own exams.
Tests vary in the number of questions, but you should plan for at least 1 hours. There is no fee, but you must bring your books, and retake the class within six months. You must reschedule with RTEC, not the instructors. If you do not pass the MCSE exam the first time, you can retake the test as soon as you feel ready. However, if you do not pass the second time, Microsoft will not release the test to you for a third time for a minimum of 14 business days.