what are the labor hrs to replace bearings

Hello, You didn't specify as to whether you are referring to pinion bearings, differential bearings, or wheel bearings. I'll list the labor times for them all: 1991 Chevrolet K1500 Pickup, Mitchell OnDemand: Differential Pinion Bearing - (Full Floating Axle) 3.6Hrs. | (Semi Floating Axle) 4Hrs. Differential Side Bearings - (Full Floating Axle) 3.4Hrs. | (Semi Floating Axle) 3.3Hrs. Wheel Bearing - (Full Floating Axle, Both) 2Hrs. | (Semi Floating Axle, Both) 1.6Hrs.