Depending on how much time you have I recommend starting your day at the visitor's center and at least seeing the orientation film and walk through the museum. While the cyclorama is amazing I don't consider it a must see unless you have extra time in your schedule or unless you will be there multiple days. That said with summer upon us now is a good time of year to work the cyclorama into a visit due to the extra sunlight that will allow you to extend your battlefield touring into around 8 pm
Lots to read & take in. I would say 2-4 hrs
Asthe others say it all depends. On time and want. Do you want a history of Gettysburg? Do you like art? The presentation is about 30 to 40 minutes total I believe and the museum has quite a few amazing things from the past. If you want to learn the history yes watch it, view it. As an art lover I recommend it just to see the painting itself
It really depends on how much you want to read about everything there. You could take an hour to 2 hours. Everything there is very interesting.
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