24/7

UK [ˌtwentɪ fɔː(r) ˈsev(ə)n] / US [ˌtwentɪ fɔr ˈsev(ə)n] adverb informal

all the time

He thinks about her 24/7.

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Etymology:
24/7 is short for 24 hours a days, seven days a week.