ˌlong-ˈstanding BrE AmE , long‧stand‧ing /ˌlɒŋˈstændɪŋ◂ $ ˌlɒːŋ-/ adjective
having continued or existed for a long time:
a long-standing member of the committee
long-standing debate/dispute etc
a long-standing feud between the two families
the long-standing problem of keeping costs down
I have a long-standing arrangement with the bank.