Greatest in duration (7)
I believe the answer is:
longest
(Other definitions for longest that I've seen before include "Least short" , "Having the most length" , "Extending farthest" , "Of greatest duration" , "For the most time" .)
I believe the answer is:
longest
(Other definitions for longest that I've seen before include "Least short" , "Having the most length" , "Extending farthest" , "Of greatest duration" , "For the most time" .)