długoletnie doświadczenie

From long experience he knew that was the best way of getting their attention.

From long experience, I'd say you were probably a good guy.

He was used to seeing me leaving early, and his long experience told him why.

Let me share what we learned in that long experience.

He used his long experience in English conditions to great effect.

Long experience had told me that this was to be expected.

But even long experience of the high mountains is no help sometimes.

His long experience in city government has proven to be good training.

He knew I'd lived there, had a long experience but was now gone, and so would pass this writing on to someone else.

I knew that very well from long and bitter experience.