RepairPal Certified shops can diagnose and repair your 1994 Toyota Corolla. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
If the rear wheel cylinders are not rusty then it can be done in about 1 -1.5 hours. I can do it in 30 minutes, but I have lots of experience. 3 hours is over the top, ouch!