Under what condition could a vehicle legally remain parked for extended periods?

A vehicle can legally remain parked for extended periods on private property with the owner's consent because private property regulations allow the owner to set terms for parking. When an owner grants permission, the vehicle is not subject to typical parking restrictions that may apply on public roads or properties.

The other choices highlight different parking regulations that apply under various circumstances. Designated parking areas during business hours typically have time limits or require payment, while areas marked for emergency vehicles are reserved specifically for emergency use and cannot accommodate regular vehicles for extended parking. Claiming that vehicles cannot be parked under any conditions overlooks the allowances made by private property owners.