After I have completed a piece of work and sold it successfully to two or three companies for internal use, I generally have a one or two years period of ZeroHourWeek, exactly doing nothing but just answering some calls when they happen. (Never get to a complete hour within a week)
Those days seem to be over though.
A ZeroHourWeek makes a lot of sense especially after a long period in which one cannot find the discipline necessary to employ the SustainablePace of an EightHourBurn, FortyHourWeek or whatever constitutes a reasonable balance.
This is also what you get when one of the following occurs: