This summary is not the rule. The rule text controls.
When a child is kept in shelter care or detention, the court can't just let them sit there without checking in. If the child hasn't been released after their detention hearing, and hasn't had an adjudication hearing within 8 days, the court has to take another look at the case.
This check-in happens at least once every 8 days. The judge can do this either by holding another hearing or by simply reviewing the child's file. The point is to make sure no child gets stuck in detention for too long without someone checking whether that's still necessary.
This keeps happening on repeat every 8 days for as long as the child remains in detention without a full adjudication hearing. It's a safeguard to prevent kids from being held for extended periods without their case moving forward or without a judge confirming that detention is still the right call.