When building SaaS systems, as an entrepreneur it is important to pad your expectations when it comes to the QA process. Really, you should pad your expectations throughout the entire project and you’ll be much happier, but, at the very least, do it here. If the team tells you it is going to take 2 weeks to QA the product, just plan on 4 weeks of work. It may sound outrageous, but that’s almost exactly the way it goes almost every time. If you’re working with an agency that is already taking this padding into account, then I would suggestion you still pad this timeline, just not by as much.