Dear users of WhenIsGood: When you fill one of those out, are you filling out the limits of your availability to include the duration of the meeting or the limits of your availability for the meeting start time?

For example, if 3pm is a slot on the poll for a 1 hour meeting and I have a conflict at 3:30, do I select 3pm because my availability goes up until 3p or not because a meeting that starts at 3p wouldn't work?