The one i did was a few hours at most, most of which had nothing to do with trying out the moffett. There were a few of us on the course too.
However we didn’t get any decent training and turns out you can do yourself or things your carrying a lot of damage if you get it wrong (much easier than with a forklift).
Training can be very expensive and rare, but best way is to get in with a company who use them. Its very unlikely any company will take on a non experienced user and if they have other users, you can double man which is highly recommended.
According to the guy training us, forklift drivers have problems as the controls are backwards and they tip over very easily unlike forklifts.