Our cameras are capable of recording 45 minutes at the time we need, so that you go more to the point we have created a specific section with the time that is able to record each spy camera. A camera recording can last in an indefinite manner as long as we connect it to the current, but beware, not all hidden cameras are capable of recording connected to the current, in fact, most spy glasses are not capable of recording while they are connected to the current.
For example, recording with a desk clock with a hidden lens is a commonly used option, since they usually have a battery of about 2,000 mAh that will give us a range of about 6 hours, but also, if we connect it to the current will have an unlimited autonomy, which means that we should not worry about it being exhausted. In this case we talk about the desktop clock with camera to record in a hidden way.
Now we are on the opposite side, for example record with spy key rings will give us a range of approximately 60-80 minutes, and although they are connected to the current we can not continue making recordings.