I did a marathon portrait session in August 2007 where I to 50 portraits in under 2 hours. I had to keep the lighting simple so that I could focus on arrangement instead of messing around with the lighting. A sort of studio production line. This was one of the last ones and the only group photo I did. Only 1 light with a softbox was used on camera right placed above head-height.
Canon EOS 5D
EF 35mm f/1.4 L
f/11 1/125th ISO 200 Manual Exposure