When you proposed the merge, the system sent an email notification to the manager of the other profile. This gives him a chance to see what was proposed and decide if he agrees. The system allows profile managers 30 days to respond to a merge proposal.
This other manager seldom edits, but his contributions history shows that he does respond to merge proposals sometimes, so I think he deserves more time on this one. I know that this waiting can be frustrating, but it is part of collaboration...