The skip the line priority access for going in and exiting saved me about 40 minutes by my estimation, well worth the money, especially if you have somewhere else to be afterwards. I think doing it after sunset is much better than it would have been during the day, good trip, spent about 30 mintues in the observatory and maybe 15 minutes getting in and out, if it took me an hour plus getting in and out it would have been frustrating, great views, get it on a clear night if you can...