Lucid Dreams
I think this was the longest I've ever had, however I think I constantly slipped in and out of Lucidity in the dream. I remember saying to myself in the dream "It's been almost 24 hours," I was in Harry Potter world which was also combined with Disney world and Universal Studios. I was in a small little underpass where there were lots of toys and colorful lights, kind of like The Disney Store. There were many Hogwarts students passing by me, greeting me with "Hellos" and what not. ... I spent the majority of the time just looking around at things, being amazed, but I also wasn't focused enough. I was in a low level Lucid Dream.
I knew WBTB was the way to go. It's the first time I've used this method in a while, and it works immediately. I am in a desert, the sky is a mixture of stormy weather and sunlight. A storm off in the distance, above a boiling volcano. The ground is cracked and dry, I spin around trying to stabilize the environment, trying to fill in the missing pieces for my brain by sight, but it's no use.