While I'm sure Obama physically could go on that long content would be light, limited to "uh,uh,uh, I,I,um, uh,uh hold on, I,I,I, ...". As a practical matter he could never do it. The building stress of knowing that he was missing an episode of the Kardashians or Dancing with the Stars or basketball talk on ESPN would throw him off his train of thought. He's as hooked on that junk as he is on nicotine or power.
I doubt that he could stay away from Reggie that long. :)