Enforce a one-week-multiple minimum runtime even after hitting sample size: weekday and weekend buyers convert

Enforce a one-week-multiple minimum runtime even after hitting sample size: weekday and weekend buyers convert differently.
Reaching n on a Tuesday doesn't mean you've seen a representative week.
— Set runtime = max(required-sample-days, full 7-day cycles).
— Always end on the same weekday you started. Stop mid-week and you over-weight one buying mode.
— For B2B, watch the business-day skew; for retail, the weekend spike.
— If a holiday or sale falls inside the window, extend or flag the result.
Sample size answers 'how many'; the weekly cycle answers 'which kind'. You need both. Read the number, not the story. [runtime = whole weeks]