Tough work schedule (6)
I believe the answer is:
nights
(Other definitions for nights that I've seen before include "See 1" , "Times between days" , "Periods of darkness" , "See 9" , "Periods after sunset" .)
I believe the answer is:
nights
(Other definitions for nights that I've seen before include "See 1" , "Times between days" , "Periods of darkness" , "See 9" , "Periods after sunset" .)