Bruno Buchet reached 7000m on K2 recently. At this point he setup camp 3. It took him 2 days to cover what was expected to take only 1. The deep snow prevented them going any quicker. He would have gone down to base camp waiting for the weather to clear.
The weather window, he says, is expected to not open again till early August. When it does he will attempt to go to camp 4 at about 8000m.
Source: Bruno Buchet