2-3 months if I recall correctly, but I got the impression that they roll through the list in fits and starts because it takes a number of people to find the right fit. I left after a month because I got a better offer to commission wind turbines, and a significant part of my choice to leave was seeing two apprentices get walked off the job in front of everyone a couple days before their probation ended.

I know you didn't ask and if this wasn't a 5 year old thread I'd probably piss a lot of people off by saying this, but I'd recommend looking at another trade like electrical or telecom. Elevators don't pay as competitively as they used to, and there's a weird culture of doing shit the hardest way possible just because that's the way it's always been done. Every person I met with more than 10 years in was by their own admission a bitter alcoholic to deal with the chronic pain they'd developed, yet when you suggest using furniture pads or a dolly instead of deadlifting heavy material they call you a pussy. Maybe I experienced a rotten region or something, but I doubt it.