time waster

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time waster [noun]

you say that someone or something is a time waster, you mean that they cause you to spend a lot of time doing something that is unnecessary or does not produce any benefit.

Example: 

Surfing the Internet is fun, but it's also a time waster.

Cambridge Advanced Learner's Dictionary

time-waster

noun [ C ]

someone who causes another person to waste time doing something that does not achieveany good result:

The ad was answered by a lot of time-wasters who didn't even seriously want the job.

an activity that takes a lot of time and does not achieve anything important:

The internet has replaced television as the biggest time-waster ever invented.

Collins Advanced Learner’s English Dictionary

time waster

 time wasters
 also time-waster
 N-COUNT (disapproval)

 If you say that someone or something is a time waster, you mean that they cause you to spend a lot of time doing something that is unnecessary or does not produce any benefit.
  Surfing the Internet is fun, but it's also a time waster.