1st floor: Kill 5 Shades to get a 2nd magic cell or ja, and get medecine in the 4 chests. If your group is average, kill 2-3 more shade until you get decently geared.
For bottom room, have someone with range and reraise pull the 6 Shade from max range, and 2 of your melee voke them off him and fight in south part of the room. The other 4 shades should lose aggro and come back after. Repeat untill the room is cleared. Make sure to kill the right mnk first (drop 3 magics) and give those to your melee tank. They will need it on 2nd floor.
2nd floor: Not much to say, just kill shade 1 by 1. If there is link, pull imp first and let the puller kiter shade (mages need to stand up).
On a normal run, you should have about 50 minutes left at this point
3rd floor: As soon you zone in, run asap and ninja past the rampart before it pop undead monsters that aggro sound (ppl always aggro them because they are slow and stupid)
Clearing gears room take approximatively 15min if you don't get massive link. In case of massive link, have the puller run really far, and everything should lose aggro
4th floor:
If you're doing CC, there is plenty of method to deal with it, but my favorite with 7-8ppl is to send 4 puller and a suicide puller THF (with RR). Thief aggro the whole room, and every melee bring back their rampart to entrance. After that, you can fight CC in 4 chest room in the first corner on your left (have someone watch for the gears train). You can fight the chariot there as well.