New hires, no prior electrical experience, for commercial and multifam (guessing that's new construction so pretty fast paced with low bids to get in and then (stuff that old school experienced tradesmen, might object to).
Four hours / month for training them.
I would start with four hours of going back over and taking their work apart to see what problems may be seen, but that's not the class part.
Buy them at least one set of good sweat wicking Tecasafe shirt / pants so you are showing them at one thing that works, for them to survive at the job while they progress. If you're not willing to do that, well, training sled dogs ...
Electrical is so vast no one knows it all but the way to get there is a lifetime of self study. Could you teach the hunger to learn more from self study. I see people with all ranges of experience getting beat up for no reason.
Make sure they get their apprenticeship hours, plenty of good food, water, sleep. Breaktime to eat. I see shortcuts taken there. During the class they should be in comfortable chairs and eating well so it's a twofer, paid time off their feet to eat and have class. I would be looking at the guy who knows how to take care of himself by eating during break, in this class, and not the guy who sees class holding up his smoke break.
Electrical can be fun and if not they're doing it wrong. Do you know this and can teach that. If it's not fun, teach how to protect from the hazards, that's dust heat noise lack of food / water, and not to just smoke their way through the sled dogging it.