How long could he take it?

After reading about President Obama sitting patiently and attentively through a 50-minute anti-American diatribe by Nicaraguan President Daniel Ortega, two speculative questions came to mind:

1) How long into a 50-minute speech being delivered by Rush Limbaugh would it have taken Obama to walk out in disgust; and

2) What would Obama have done for the other 48 minutes?