Flatten the Cotton

I left my rounded mass of cotton candy on my dresser for a few days after I bought it. Thanks to gravity, it didn't stay round very long. Instead, it started to flatten against the dresser. When I propped it up against my jewelry box instead, it sank around the edges of the box, retaining the shape of the corner.

I wonder how long I'd have to leave it to let it get as flat as a pancake?