that depends on the dog and what exactly you want. there are lots of steps in training and it just depends on what step you want to stop at. do you want the dog to be able to run blinds and sit and watch 2-3 birds land and they will retrieve them one at a time. (multiples)
Skyblaster, As long as you are sending the pup to a trainer, don't hold off on the blinds. It wont cost any more and it will come in handy if you shoot ducks or doves. Help that pup be all he can be ! You wont be disappointed!