Bùyào hàofèi shíjiān zài wúyì yì de shìqing shàng.
Don't waste time on meaningless things.
Tips
usage
Compare with 花费 (huāfèi): 耗费 emphasizes depletion and waste, while 花费 is more neutral about spending. 耗费 often implies the expenditure is large or regrettable.