B2 adjective, adverb /ˈlɒŋ taɪm/
long-time
দীর্ঘদিনের
Meaning
lasting or existing for a long period of time; having continued for many years
Example
She is a long-time friend of my family.
সে আমার পরিবারের একজন দীর্ঘদিনের বন্ধু।