Admiring someone for a long time means admiring someone, which means respecting and admiring. Usually used to meet for the first time, it is intended to raise the social status of others, and it is a respectful greeting.

For example, I have heard a lot about the great soldier Mu Chaomoon. Today, I was lucky enough to see the talent of a great soldier. This life is really worthwhile!

I have heard many synonyms, such as pleasure, honor and so on. It's all pleasantries to say it's an honor to meet each other.