How long for the first PS4 price drop

Hey, so this is complete guess work for anyone that answers.

Anyway.. traditionally how long does it take for the major consoles that actually sell *everything except the Wii U* to have their first price drop. Does anyone remember how long after the launch of the PS3 or Xbox 360 it was?

I want to buy a PS4 eventually but don't want to fork out the full release date price as i dont play so much to justify launch date pricing.

Thanks and any guesstimates are appreciated =)