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How much time should I expect to 'leave' at the end of a conference presentation for questions? This question suggests to allocate 2-3 minutes per slide, including front/back matter (like a question slide). Does this mean I should leave 2-3 minutes for every 15 minutes of presentation delivered? Is there a good 'rule of thumb' for this?

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    There is no "correct" answer to this. Just ask the session moderator what they recommend and follow that. – eykanal Mar 6 '17 at 21:33
  • And even that may chance sometimes. In more "relaxed" conferences, the chair might let you use a bit more time if previous presenters were too quick. – Fábio Dias Mar 6 '17 at 22:57
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The only rule of thumb I'm familiar with is a bit like this, keeping in mind that some of the additional time may serve as buffer in case there are questions during the talk:

  • For talks of or less than 30 minutes total, include no less than 5 and no more than 10 minutes for questions.
  • For talks between 30 and 60 minutes, include no less than 10 and no more than 15 minutes for questions.

So that essentially means at least 5 minutes for each half hour (not too far off from your estimates).

For longer talks, there never seems to be enough time for questions, so I would suspect there isn't one rule for all situations.

  • Good answer. Better to choose a number based on the length of the talk than on the number of slides. Some slides are dense, some are dynamic and get flipped through quickly. – aparente001 Mar 7 '17 at 5:43
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    Rarely (never?) does an audience complain that the presentation ended too early. (Particularly at a conference when it can be hard to stay on schedule in the first place and is running late) – Carol Mar 7 '17 at 15:21

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