long-time
US /ˈlɔŋ.taɪm/
UK /ˈlɔŋ.taɪm/

1.
давний, многолетний
having existed or continued for a long period of time
:
•
They are long-time friends who have known each other since childhood.
Они давние друзья, знающие друг друга с детства.
•
She is a long-time resident of this town.
Она давний житель этого города.