I'm 13 weeks into a 20 week academy right now. I thought I was in shape when it started. I passed the physical test for the agency with no problems. However, in the academy it is a whole different ball game. I was actually out of shape compared to some of the other people. I've shown quite a bit of improvement over the past few months because I had a lot to improve on! I would recommend being in the best shape possible by the first day of class.
That said, the PT standards at my academy are gradual. What we did the first week is not anything like we are doing now. They work us into longer runs, etc. I'm sure they do that at most places, but looking back on it, I wish I had been in better shape when I started.
Hutch
"For his ignorance, I pitied him; for his insolence, I forgave him; for his insubordination, I slew him."
---Orton Williams