What factors would you weigh in for a hypothetical coefficient of developer stress?

The other day, I and Siddarthan, were discussing about the nitty gritties of a feature; when he said, "my stress is directly proportional to the amount of time I spend developing a feature without deploying it".

We joked about Sid's coefficient of developer stress. :D

var developerStress = k * timeTakenToDeploy;

k being Sid's coefficient of developer stress.

So, what factors would you weigh in before you come up with your own coefficient of developer stress?