[kbs666]

23 at least announced PF1 AP's. I'm guessing considering Return of the Runelords ends in 7 months that the first PF2 AP will start then with ReturnotRL serving as the capstone of the PF1 AP's.

I've run RotRL several times and I cannot imagine it taking less than a year to complete unless you go for marathon 8 or 10 hour game sessions. The same goes for all the AP's I'm familiar enough with to run, Skull and Shackles, Jade Regent, Wrath of the Righteous and Giantslayer, which I'm guessing means they all are about the same length.

So that's more than enough published material to last any GM for a lifetime.