How to control the shooting time in time-lapse photography? Can I adjust the number of lenses?

25 frames per second. 1 frame is one. Controlling the shooting time is based on the length of time you need the material. Personally, I suggest that taking about 200 pictures is almost enough. As for the interval time between delays, the change speed of the subject can be observed. If it's fast, it's recommended to take 1-3 seconds each. If it is slow, it can be controlled at 5- 10 second. But the starry sky delay needs to be said separately.