Welcome Mitch. The answer to your question depends to a large extent on what you are going to be happy with. I started out taking lots (50-100) of 10 sec exposures and stacking them and was pleased with what I was achieving however as time went on I wanted to get better quality images and when I finally got autoguiding working it really opened up what I could achieve. These days anything under 5 min subs seems short. The quality of the mount will play a large part in what you can do without autoguiding.
Peter
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