Time Sink
Noun · Slang & Abbreviations
Definitions
Something that consumes far more time than its value seems to justify, often because it is messy, repetitive, or hard to make progress on. Engineers use it for tools, tickets, and rabbit holes alike.
In plain English: Something that eats a lot of time without enough payoff.
Example: "The old test harness is a total time sink whenever we need to change one assertion."