For how long may shoulder firearms be carried in the passenger compartment of a vehicle while the unit is in service?

The correct duration for which shoulder firearms may be carried in the passenger compartment of a vehicle while the unit is in service is two hours. This time frame is established to ensure that officers have a balance between accessibility to their equipment and maintaining proper safety protocols within a vehicle. The limitation allows for a sufficient time period for the officer to engage in necessary duties and maintain control over their equipment without compromising safety or protocol in the vehicle's cabin. Adhering to this time frame is important in managing the risk associated with firearms in a space that could be confined and where accidental discharge could lead to serious repercussions. The choices provided likely reflect a misunderstanding of the procedural guidelines, as carrying firearms for too long may lead to negligence in upholding safety standards.