Will long exposure hurt the camera?

If it is exposed at night, it will not damage the camera. The illumination of the night light is only 100,000 times that of the daytime sun. Some professional photographers often shoot for hours at night, which has no effect on the camera, but it takes a lot of electricity to open the shutter for such a long time. A battery may only take one photo at night. If the battery is dead and the shutter of your camera is still open, it will damage the shutter system, so be sure to have enough power. What's more, you said that the camera was turned off before the filming was finished, which is the same as what I said just now that the shutter was still open without electricity, which is not good for the shutter system. Don't do that.