2000 jimmy oil leak

My 2000 Jimmy only has 33,6xx mile, owned it now for little over 1 yr. I noticed a Leak a few days ago when i found oil in my driveway.I lokked under the car and popped open the oil filter cover and noticed the leak is coming from the lower pulley with which the serpentine belt is connected to. I have an appt at the dealer in a few days and my car is covered by a protection warranty. Any idea how long this job will take?/ and how much it would of normally cost me if I didn't have the warranty?
I'm really worried about this car within the time I owned it, it needed a new serpentine belt, and lower ball joints all of which were replaced at about 28,000 miles!

Are you sure it is coming from there or the oil cooler lines leaking.

Front main seal repair is quite expensive.

You watch, they will try to get out of doing it.