Yes, there has to be a balance. If the prompts freezes are more frequent, perhaps they should be shorter. But if you make them too short, people will ignore them or find them an irritation, not an opportunity. I think week long freezes are good, but I'm not sure how much time there should be between them. A week may be too little time to balance out a week of freeze. Another anon suggested a five day business as usual, followed by a two day freeze. I think that would be so little of a freeze and so much switching back and forth that no one would pay attention to the freezes. It would make more work for the mods too, I suspect.