5H is far too long to replace one caliper even after having to bleed the brakes. What is wrong with the caliper? Is it sticky? FYI I had a front sticky caliper last year on my X that would not retract properly after braking. I was able to fix it while changing my pads and rotors by doing the following. After removing the old pads I pressed the brakes to get the brake piston out to its almost max and cleaned the calipers and pistons with brake cleaner. I then sanded the side of the piston with 800 sand paper. Cleaned the all caliper again with brake cleaner and I lubricated the sides of the pistons with some drops of ATF oil and pushed it back using the old pad and a clamp. Between replacing the front rotors and pads and working on the caliper it took me about 2h. 10k miles later I still have no more problem with the sticky caliper.