establishment of a working 'pace' at a job, usually performing boring repetitive tasks that can be done in ones' sleep!! one can simply 'tune out', while still perfectly performing the job. you show up a eight, go into your 'trance', look up; and the clock reads 4:30p!

a job with different tasks or more variety requires more concentration, i.e. 'work' or disruption of ones' mental 'rhythm'

this theory could be PART of a job granting one a PERIOD of repetition OR; the entire day of repetitive task/s.
this idea could be experienced in assembly line type jobs, or jobs which entail tasks that always remain pretty much the same.