Assume that after website redesign launch the website gets about 10,000 visitors a day of which about 500 visitors click to the product page (5%), and you are considering the original website plus one additional variant. It is decided that you want to see a minimum of 100 additional visitors per day clicking through to the product page(a 20% relative improvement), and you are willing to accept standard statistical significance (.05) and power (.80), how long would you need to run the A/B test for any change that you make to the website?