Despite the snark of your answer, I'd be interested to know if you have any examples of science-based time management. It seems that this field is mostly trial-and-error, the techniques either work for you or don't.
Eh it's not like I intended pseudoscience as pejorative, but as in there some evidence in cognitive science that defocusing and refocusing on tasks help efficiency, but as all thing in this field reproducibility and other issues make it a tall order to call it scientific.