Is there a good estimate based on the books of how long the Basic training at Camp Currie lasted?
In the book, we see that the bug war continues with one of the other races changing from bug ally to neutral to human ally so it appears that Officer Candidate School is several years in length. The analogy to west point also seems to imply that it is several years long. Basic training also seems to be longer as the bug war itself changes from threats into full scale war. The implication seems to be that it is longer than the normal type of basic that would be occurring nowadays.
The fact of his father entering the war and becoming a senior NCO after the attack on Earth would imply a longer period of time. That is, the basic training would be close to a significant fraction of the time taken up by OCS.