Alpha company, right? I was Alpha last year. He should receive his orders right before he graduates TBS. They are pretty flexible with the amount of time to get to Pcola (within reason). He will just have to talk to his company staff to make sure his orders allow him to take any leave in route or anything like that.
The wait to start API can vary, some people can hop in within 2 months, others can be 6+ months. Its all about timing, but he can expect a little break. That being said, he might have a stash job to take up his time.
Now, if he hasn't done IFS, they might have him stay and do it in Quantico. Some people came down here at did it as well, so that varies too.
Let me know if you have any other questions.