I'm trying but failing to figure out how the "weekly" period is defined for Questionnaires. Is it "7 days from user's last response"? It doesn't seem to be based off the start date of the course, and I can't find any setting which makes it teacher-configurable.
A teacher-configurable week would actually be my preference, though I respect that's probably a significant change. My use cases work off the assumption that a faculty member wants a questionnaire filled out once per calendar week. If it's defined by the student's behavior, there's the potential for cascading procrastination. (If you don't fill out this week's survey until Friday, then you can't fill it out the next week's survey until next Friday. You'll never be able to dig yourself out.)
Of course, sometimes that's how the world works and maybe you should learn that lesson sooner rather than later. But I hate it when a system imposes "life's tough, get a helmet" pedagogy on a class.