Generally it doesn't even take 2 hours
I learned on a 152 and going onto an Archer III took be exactly 1hour 15mins... checked the logbook there, and this was after about 65hours TT and about 4 months after my test, about 2 months ago actually.
It's not hard at all if you're current, especially since the 152 is a much more sensative aircraft thats "easy to fly but hard to fly well" as they say.
Generally its just a case of a few stalls to see the charachteristics, steep turns, a PFL to see the glide charachteristics, and familiarisation with autopilot and GPS (which tbh you should read up on while on the ground as well as making sure you've gone through the checklist etc and know whats going to be coming up in your checkout)
I spent about 3 hours or so just sitting in the Archer III learning the position of things and you definently need to drill into yourself that tanks need to be changed etc
All in all its a fairly simple process, learning to land wasn't a challenge atall, basically just a case of having the instructor there to prevent you damaging the thing while you suss out the different feeling etc!