Aside from pastime, what is a word or phrase that can be used to describe an activity that is not pleasurable and used only as a diversion while letting time pass?
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The noun "pastime" actually describes activity that is pleasurable.
To describe an activity that is used only as a diversion while letting time pass, you can say you are doing something to kill time.
Or you can just say you are idling, or, lollygagging.
Personally I don't think there is any word that describes an activity which is not pleasurable and used only as a diversion while letting time pass as when you want to kill time, you don't do things that are particularly not pleasurable, but things that have no purpose.
Nouns synonymous with pastime are few in number in English. Besides lollygag, the other suggestions here seem to be verbs. If you need a noun, I wonder if timekill or time-kill would work. In Indian English, time pass is a common noun.
A phrase I hear all the time in the software industry is a "time suck". Especially in reference to meetings, which are also frequently referred to as "time wasters" which is essentially the same thing, time suck just sounds better.