I've worked for ATO's who have used both schemes. 2 phases, 7 subjects per phase, good consolidated training. 3 Phases (5 subjects, 4 subjects, 5 subjects) long time studying (more cost). Both have their merits and drawbacks. Essentially you still get about the same amount of classroom time (mandated minimums). Again, it depends upon the quality of instruction and facilities too. Beware of being tempted into the "bargain basement" schools who will do you a deal, it can cost you more in the long run.