Half Hour Sessions are perfect for the quick tuneup before a game, focus on one aspect of the game, or just maintenance during in-season or off-season. 

Hour Sessions are ideal for getting significant amount of reps for either hitting or fielding.  It is also great for splitting the session in half to work on hitting and fielding or pitching.

Ideal for establishing the habits, which take at least four to five sessions, that gets results.  Also great for priority scheduling for a time that is convenient for you and your young ball player.