I don't think there's a set amount of time for loading the words. I think I spent a couple minutes on it- food motivated dog should learn quickly. Other people load the markers before each training session when they're just starting off.
Yes, you can do all those other training techniques with marker words.
If your dog is too focused on food for luring, you can teach them to target the palm of your hand or even the end of a stick and use that to lure them into position, then mark and reward. It's easy to teach- hold out your hand and when the dog sniffs it, mark and reward. Increase distance and movement of hand gradually until they naturally follow it.
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