The rate at which a 12V battery discharges can vary depending on several factors. Some of the key factors that influence the discharge speed are:

1. Battery capacity: Each battery has a certain capacity, expressed in ampere-hours (Ah). The larger the capacity of the battery, the longer it will last before it is depleted. Therefore, a battery with a higher capacity can last longer than a battery with a lower capacity.

2. Power consumption: The power consumption of connected devices or systems also determines how quickly a battery discharges. The higher the power consumption, the faster the battery will run out. Power consumers such as lighting, heating, air conditioning, audio equipment, and other electronic devices all affect the discharge rate of the battery.

3. Usage duration: How long the connected devices or systems are used obviously affects the discharge speed of the battery. For example, if you use high-power consumers for an extended period, the battery will drain faster than if you only use them briefly.

4. Charge status: A battery that is already partially discharged will run out faster than a fully charged battery. Therefore, it is important to recharge the battery regularly to maintain optimal capacity.

It is difficult to give an exact duration in which a 12V battery will be depleted because this depends on the mentioned factors and the specific conditions of use. In general, you can