Longevity Of A 5.3

[Jimbo0076]

If yall don't mind I want to slide in here and ask a rather newb question but bear with me please. Roughly how long will a good ole 5.3 run without major problems in just a daily driver Tahoe? I'm looking at one for my wife and personally had several 88-98 n 73-87 trucks but never a 99-up GM at all so stepping onto completely new ground for myself. I know the LS swap is extremely common and know all about that. Looking at a 01 Tahoe with 166k on the clock. Belongs to a friend and know its been taken care of but just wondering what usually goes wrong with these motors if anything and things to look at for when they get around these miles on it. Any other help info about the NBS to look out for or to avoid would be greatly appreciated. This will be for the boss lady....I get something I have to work on all the time or have problems I didn't know of then my a$$ will be grass and her the lawnmower