Might take a season or 2 and yes, you must have the right players to tutor them. Also give them a some first team experiences as well. A good way to get them first team chances is during cup matches or when you're playing against some crappy team in your league and you want to do a rotation for that match to keep players fresh.Sorry if an answer has been posted.
How do you get your youngsters to their 5 star potential?
How long should it take?
Thanks