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To answer your questions in brief: You must have 185 hours minimum by test day. Usually people hour build to 155 hours, then sit a 30 hour modular course. If you have an ICAO professional licence already, you don't have to do 30 hours (it is training as required, but don't expect that to be none) but you do still have to have a total of 185 hours.
Jobs - almost non-existent unless you have an instructors rating or an instrument rating.