Final Animation - Render Quality Changes.

Following on from my test shots and the first 10 seconds of my 3D animation I have had to make some adjustments related to the render quality of the final animation frames. When I rendered out in HD1080 with mental ray set to 1.00 my render time per frame was around the 10 minute mark. However when I rendered out in HD720 with mental ray set to 2.00 my render time per frame was around the 5 minute mark so around half the original render time per frame. As a result of this I have decided to go with HD720 as my render quality just to save time with rendering as I have a lot of frames to render with many of them including nfluid animations. Comprising is worthwhile because I would rather render at HD720 with a completed animation over rendering at HD1080 and have a half completed animation.