At my organization we follow a schedule so there's a release to production every 4 weeks. So the Sprint schedule is setup the following way: Two weeks development then we go into one week QA. After QA signs off, we go into UAT and at that time the development for the next sprint starts. So the UAT is not part of the sprint. Is it ok to move with the above schedule if we promised our client a new release every 4 weeks?