We've all had days when we are stressed to come into work, stressed at work, and then have stress when we go home from work. On those days there might not be any laughing. A life without any laughing is sad. But I think for most of us, on most days there are a couple laughs. I'm not sure what a target laughs per hour rate is, but I think in the range of .25 laughs per hour to 2 laughs per hour is probably in the ball park. That means even on the low end there are two laughs in the day. That's still a nice amount of laughing at work, even if that low rate is entirely sarcasm. Of course on the high side, work does need to be done, and comedy can often be making fun of a person or group, so having a lot of laughs per hour is probably not appropriate either because it's bound to marginalize someone in the office.
There you have it, a new metric to measure cultures by: laughs per hour.