Usability Testing or User Testing is an important part of User Research. Since I have performed a variety of usability testing in diverse vertical industries a lot of times, for straightforward scenarios, I usually spend less than a day for planning, execute in one day, and deliver on the same day or the next day. A more comprehensive deliverable from a usability testing may take longer than a day. The length of user research participant recruitment and screening, which corresponds directly to the theme of this article, depends on requirements.