Examples of using "подолгу" in a sentence and their english translations:
We take long walks together.
Tom and I often take long walks together.
Your replies have been slow lately. Have you been busy?
Tom never stays anywhere very long.
I do not like the habit certain tennis players have when they bounce the ball excessively before serving, especially on important points. Bouncing the ball more than, say, 10 times should be penalised for deliberately delaying the play.