all-time

Từ điển Oxford Advanced Learner 8th

ˈall-time [all-time] BrE NAmE adjective only before noun
(used when you are comparing things or saying how good or bad sth is) of any time
•one of the all-time great players
•my all-time favourite song
•Unemployment reached an all-time record of 3 million.
•Profits are at an all-time high/low.