Our QA works in sprints of 7 days. We suggest hiring two QA specialists. This size of the team will make sure that they have enough time to check content in a span of a week before the public release.
A team of 2 QA managers can check up to 4 updates per month. It is highly likely that only one QA manager won’t have enough time to properly check big updates in a week, we don’t recommend it.