Final answer:
The shelter hearing must be held by Monday at 10 PM, assuming that the courts do not operate on weekends and adhering to procedures that require the hearing to happen on the next judicial day after the child is sheltered.
Step-by-step explanation:
If a child is sheltered on Friday at 10PM, according to juvenile court procedures regarding the timeline for a shelter hearing, the hearing must typically be held the next judicial day, which would exclude weekends unless the court operates on weekends. Therefore, if we operate under the assumption that the courts do not work on weekends (unless a different jurisdiction's rule applies), the shelter hearing must be held by Monday at 10 PM. This ensures that the child's case is heard promptly and their legal rights are protected.