3 Sentences With "doing nothing useful"

How to use doing nothing useful in a sentence? Find typical usage patterns (collocations)/phrases/context for "doing nothing useful" and check conjugation/comparative form for "doing nothing useful". Mastering all the usages of "doing nothing useful" from sentence examples published by news publications.

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I can spend that time sitting on the couch doing nothing useful, or I can spend it transforming into a better version of myself. from The New York Times
Oxford Prison & Castle museum. The crank machine was a penal labour device used in England in the 19th century. It consisted of a hand-turned crank which forced four large cups or ladles through sand inside a drum, doing nothing useful. The prisoner would typically be forced to do 6,000–14,400 revolutions over the period of six hours per day (1.5–3.6 seconds per revolution).
Prisoners had to work six or more hours a day, climbing the equivalent of 5,000 to 14,000 vertical feet. While the purpose was mainly punitive, the mills could have been used to grind grain, pump water, or operate a ventilation system. Shot drill involved stooping without bending the knees, lifting a heavy cannonball slowly to chest height, taking three steps to the right, replacing it on the ground, stepping back three paces, and repeating, moving cannonballs from one pile to another. The crank machine was a device which turned a crank by hand which in turn forced four large cups or ladles through sand inside a drum, doing nothing useful. Male prisoners had to turn the handle 6,000–14,400 times over the period of six hours a day (1.5–3.6 seconds per turn), as registered on a dial.