I imagine from a light polluted backyard in the suburbs. This means I need very long exposures to accumulate enough signal to make good images. However the sky is bright enough (from light pollution) that I cannot take long exposures or I will saturate my CCD camera. Fortunately you can combine dozens of shorter exposures and achieve similar results to taking very long individual exposures.
This article discusses how short your sub-exposures can be.
Here is a single 1 minute L expsosure of the galaxy M63:
and this is the combination of 115 frames, each 1 minute long: