Have to agree with Dom, having seen the utter devistation caused by a mistake on the feed speed on a CNC milling centre a few years ago as the investigating health and safety officer (also first first-aider on scene) I can assure you that no matter how good an engineer you are or what level of experience you have on manuals CNC can not and should not be rushed into.
I've looked at courses fairly recently and most are around 300 hours.
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