Final answer:
The cure time for joint cement before pressure testing depends on the type and temperature but typically ranges from hours to days; refer to manufacturer specifications for accurate times.
Step-by-step explanation:
The question pertains to the required cure time of a joint cement applied to a pipe at a specific temperature before the system can be pressure tested. Cure time is dependent on the type of cement and environmental conditions such as temperature. Unfortunately, with the given information, it is not possible to provide a precise cure time. The cure time for joint cement can vary from several hours to days based on the formula of the cement and the surrounding temperature, and the information provided does not specify the type of cement used. Typically, manufacturers provide a detailed table or instructions indicating cure times at various temperatures. It is crucial to refer to the manufacturer's specifications for accurate cure time before pressure testing any piping system.