Simplify the following text for a Grade 5 native English-speaking person.
Original: Ed Leonard , CTO of DreamWorks Animation , says it took approximately 45.6 million computing hours to make Monsters vs. Aliens , more than eight times as many as the original Shrek .
Simplified: Ed Leonard , CTO of DreamWorks Animation , says it took about 45.6 million hours to make Monsters vs. Aliens , more than eight times as many as the first Shrek .