I previously worked with my partner and we found that two people working effectively got through the work, in the time, three working individually, would take.
Obviously, both have to be experienced and have an affinity, but it really does work in these circumstances.
The other side, of course, is working with someone who can't achieve the same standard. In this scenario, they can still be used effectively, by cleaning around the peripheral areas, leaving the tracking,etc to the ' expert '
angie