Description of problem:
Control plane upgrades takes about 23 minutes on average. The shortest time I saw was 14 minutes, and the longest is 43 minutes.
The requirement is < 10 min for a successful complete control plane upgrade.

Version-Release number of selected component (if applicable): 4.12.12

How reproducible:
100 %

Steps to Reproduce:

1. Install a hosted cluster on 4.12.12. Wait for it to be 'ready'.
2. Upgrade the control plane to 4.12.13 via OCM.

Actual results: upgrade completes on average after 23 minutes.

Expected results: upgrade completes after < 10 min

Additional info:

N/A