The version you gave me was b1, b2 looks like better and different textures.
http://www.cfegames.com/maps.php?id=cs_greatassault_b1
If you can find another b2 download link, I'll start waypointing that one as well.
1 waypoint takes 20 minutes depending on the size of the map.
Big maps take normally around 30 minutes to 1 hour to waypoint.