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I don't think that this is the best explanation: "Он давно изучает русский язык". Это настоящее время

Some examples in order to see if I understood
1. Он долго одевается = He is dressing for a long time (based on what you said). Here I would have bet that it means: "He takes a long time to dress"...

Is anyone kind enough to explain with examples their difference?
For example in my eyes both mean: long or too long.
For example these two expression in my eyes are 100% identical:
1. Мы давно не...