It only takes one long-winded ninny to hijack the Q&A portion of your presentation and turn it into an episode of C-SPAN. Laura Bergells provides three quick steps to shut down these snooze-inducers.
Cure the Bore
First, tell the hog you need to interrupt—do not ask; just cut the person off. Second, mention that there is only “limited time,” indicating that you value the audience in attendance’s time, unlike Blab-Bot5000. Third, move it along, asking who else has a question, and making eye contact to encourage someone, anyone else to ask a question. You can read Bergells’ original post here: http://maniactive.com/blog/how-to-stop-a-boorish-qa-hog-in-3-easy-steps/