the healing of the stress fracture is the easy so to speak, that is the easiest sort of time frame to predict(usually 6/8 weeks for it to heal), training part which we cant predict as easy, since too soon will cause a set back and too late will hinder the team and player,
can imagine if anything at the start is will be light train in the pool or something, so as to not put massive pressure on the back, then build it up