Hollow out an object?

hi, I saw a tutorial on how to hollow out an object and I gave it a try. My problem is I don't understand why when I open it in my printing software the elapsed time is even a little higher than the original file. I really wanted to reduce the printing time so any help understanding would be nice. thanks. this is the link to the original on thingiverse: http://www.thingiverse.com/thing:462750 



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