Flexible end date/times for habits

For example, assume i want to create a habit of dusting surfaces sometime during the weekend (sometime between Friday evening & Sunday afternoon).

In that case I'd like the end time/date to be flexible (the task shouldn't have to disappear at the end of Friday, and i shouldn't have to ask it to repeat the same task fri, sat, sun because once I mark it as done, I'd like it to disappear).