Figure on two years to start to get anything resembling something worth catching. At one extreme, where the lake is very productive, the fry planted were reasonably large, and they were planted very early in the season you might get catchable fish by the fall. At the other extreme, if an unproductive lake was stocked late in the season the fry might not get much, if any, growth before the lake becomes ice covered and it might take 3 or more years to start to get catchable fish.