Since you won't be drinking beers and this is your first go at it I'll say, First side 2-2.5 hrs. Second side always goes faster. Do your self a favor and crack the 36mm hub nut before you even jack it up. It's on there, like 280ft lbs on there. You will need a breaker bar and a good pipe to put on the end for leverage. The hub bolts will also be a pain in the ass. 3 1/2" or 13mm TWELVE POINT!!!!. USE A 12 POINT SOCKET!!!!. When removing the knuckle don't be afraid to get a little crazy with a hammer and only hit it on the "shelf". If you hit it where the hub bolt goes you could and probably will mess up the knuckle.
Best thing to do is get a Haynes manual or one of the other repair manuals on the market for your year jeep, then read how to replace the ball joints. Read it several times, then take your manual out to your jeep and read it again and look at what you need to remove and where it is.
mine has one guy with a decent amount of knowledge, a hunch back old women, and a bunch of prissy girls that come out side to test your battery and have to study everything for a few minute before they figure it out, useless, thank god for the internet. DISCLAIMER- not all females are the same, these just don't know anything usefull about mechanics.