Yea, lucid dreams can become extremely long. Definitely longer than non-lucids, but I'm not sure if I just remember the longer non-LDs differently.

But yea I've definitely had LDs 30 minutes+, they usually feel longer for some reason. Once you become better, you'll be able to ride your LD until your body wakes you up. Probably the most important thing is to just always do a reality check when you wake up so the false awakenings don't trick you. The other important thing is to relax during the dream so you don't wake yourself up. If your dream fades, always be calm and ride the black until you can see or feel something.