How long does it take for the potable water system to warm up on the CRJ 700?

The potable water system on the CRJ 700 does not require any time to warm up before it becomes functional. This system is designed to deliver water at ambient temperature, meaning it can be drawn from the system immediately after it is activated or maintained. There is no significant heating process involved that would delay its readiness for use.

In contrast, the other options imply a waiting period that does not align with the system's operation. The potable water system is intended to be efficient and readily available without unnecessary delays. Therefore, understanding that the system operates effectively without any warming time is crucial for efficient aircraft operations and ensuring timely service.