By far the longest I've played with a pro was back in 2008. I was knocked out of a live tournament, the Irish Open, just before the end of day 1, during which my table didn't break. Christer Johannson had won a WPT in season 1, beating a final table that included Alan Cunningham and Tony G. He won the Irish Open a year later, and has over $2 million in total live winnings.
I never played a big pot with him. He was seated to my right, and built an above-average stack fairly early, after which he opened quite a few pots. I was fairly card dead and never got more than 10-12% above the starting stack and was below average almost the entire day. So, the couple of pots I was involved in against him were shove re-steals after he opened in LP. I remember I had a mid-pair once and A4 the other time. He folded both times. Nothing special. I might not even have remembered them except for the fact they were against a guy I had seen on TV. In any case, I did win some chips from him overall, not surprising given I had position on him all day.