What others have said is correct. The break between 2 and 3 is about a week, and they are done together. The week facilitates travel from one base to another. It IS possible (rare) to do 3 before 2, we had a few like that in our class. The only reason was because they were AD LTs that were snowbirding waiting for slots, bolc2 was full so they were sent to bolc3 first.
Its tough, but oftentimes you have to learn to plan your personal life around the military instead of the other way around.
Regard your soldiers as your children, and they will follow you into the deepest valleys; look upon them as your own beloved sons, and they will stand by you even unto death. --Sun Tzu