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(it's) about time
An expression used to emphasize that something should have occurred a long time ago. Well, it's about time you got here—I've been waiting for an hour! It's about time that high schools taught their students about basic banking and finance. A: "He finally moved out of his parents' house." B: "About time! He's 40 years old."
Long past the right time; also, approximately the right time. Thus, It's about time you went to bed can mean either that you should have gone to bed much earlier (often stated with emphasis on the word time), or that now is the appropriate time for you to retire. [Early 1900s] For a synonym, see high time.