How much is it to change a alternator belt?

i have a 97 nissian pick-up truck with 3 diff belts.im dumb when it comes to this i just dont want to get ripped off.thanks|||Shouldn%26#039;t be more then 30 min labor plus belt, you might want to do all three since they all have to be removed and if they%26#039;re original they%26#039;re due anyway.|||If the alt belt is bad chances are the othere 2 are on there way out to. Belts run $8.00 to $15.00 each. Labor should be no more then $15.00|||it may be cheaper to replace all three belts,given time if no bolts are frozen about one hour. what is the labor rate .belts are approx twelve dollars each