I just did the hop from C to B yesterday (just arrived in CPH on SK910) and it took me perhaps 25 minutes from the Polaris Lounge to the departure gate, including waiting to board the bus at gate C71.

The SAS and LH lounges in B are a complete zoo currently and it's only getting worse for summer. The Polaris lounge, while quite full in the afternoon, is the better choice and worth the detour imho.