Two people have already pointed this out to me at work today.
The formula that calculates this, from the BBC link above:
The formula for the day of misery reads 1/8W+(D-d) 3/8xTQ MxNA.
Where W is weather, D is debt - minus the money (d) due on January's pay day - and T is the time since Christmas. Q is the period since the failure to quit a bad habit, M stands for general motivational levels and NA is the need to take action and do something about it.
It strikes me that there's some work-related alteration that could be made to this formula - maybe W is how long you've been working on this project and D is the resources you actually need to get it done minus (d) the resources anyone's actually going to give you to do it with and T is the number of days you have before your project locks down for good.