Old man in the corner

I sat in this waiting room yesterday for about 10 minutes, and about an hour later for another 5 minutes. An old man was sitting in the corner, wearing non-descript, drab grey and brown clothes, head lowered and hands leaning on his cane. He didn't respond to my "hello-s", or my "goodbye-s". He never flinched or moved, and as far as I could tell he didn't move in that hour I was gone either.

When was the last time I sat someplace without speaking or moving for an entire hour?