Read the 5 things here. Here’s 3 things I pulled from their list:

• The Driller consists of 70,051 parts. Only a few artists working with ILM’s most powerful desktop machines were able to load the shots where the Driller takes on the building. And they sometimes waited nearly an hour for the files to load.
• It took a staggering 288 hours per frame to render the Driller along with the photoreal CG building that includes all those reflections in its glass.
• For a last push on the final weekend of work, ILM’s entire render farm was used for Transformers 3. ILM calculates that that added up to more than 200,000 rendering hours per day — or the equivalent of 22.8 years of render time in a 24-hour period

I’m guessing the 288 hours per frame was just part of the 200,000 hours per day ?

via ‘Transformers: Dark of the Moon’s’ Powerful Visual Effects: 5 Things to Know About How They Did It – The Hollywood Reporter. via Mathieu Leclaire on the XSI Mailing List