Funny, my FSDO examiner resulted in a 4 hour oral and a 1.5 hour flight.

I know a couple people that went through the 10 day CFI, CFII, MEI thing. They had good things to say about the program. The one thing that running through all of that so quickly doesn't do is prepare you to instruct. At least that's what my friends mentioned after they had been sitting in the right seat for a couple weeks.