I used the built in intervalometer on my camera to take 13 second exposures with a one second gap inbetween the exposures. I ended up with roughly 150 photos which in total was around 30 minutes. When I got home I uploaded the photos into lightroom classic, selected all the photos, opened them as layers in photoshop, clicked on “normal” in the layers tab on the bottom right and then selected lighten. After that I merged the layers together and saved the file so it would go back into lightroom classic.
Give me one or two months, at the moment there’s not enough activity during the dark hours so I gotta wait for the sun to rise later and the sun to set earlier