Yeah things are moving a lot quicker then they used to these days. They are placing people in class as the background/PRIA is still being run. That being said, you can extend your availability out as far a 6 months. For example, you interview on June 1, you can let them know you aren't avail until Dec 1. Anything farther out then 6 months gets complicated with PRIA and what not. I'd suggest if you wanna be here, apply and interview ASAP.