Should Buddhists give their time to helping others?

I'm new to Buddhism. I was familiarizing myself with the "Four Seals" in [This Article](http://www.shambhalasun.com/index.php?option=com_content&task=view&id=3025) . The article connects the first truth, that all compounded things are impermanent, to charity. He said that giving our things to others is a good way to practice coming to terms with the fact that all things don't last. I was wondering if time is included as one of those "things" that we should disconnect ourselves from and give to others? Is time a "compounded thing?"