Organizing usability tests is not expensive compared to the value they provide. We recommend semi-formal usability tests as they are the best value for money – they provide good insights and minimize research bias without requiring too much effort. A semi-formal test means that you create an easy test scenario and you invite the right people but academic perfection is not required. To conduct one usability test we need about 2-4 hours of work. That includes preparing user testing scenario, preparing for the interview, writing down conclusions etc. It is recommended to have at least 5 user tests, so it takes about 10-20 hours to set everything up. It will surely save more time during development!