For surveys that you receive a “quota full” message they do not count as completed surveys and accrue no rewards as the information is not used.
If you receive “quota full” the survey is normally full of respondents within the targeted range.
This can either be before the start of a survey, which is normally indicated as closed, or sometimes in the early part of a survey where certain criteria within the survey becomes filled (for example, within a certain age bracket).
This will vary at the rate any given survey is responded to and the overall amount of responses needed by different people to fill a quota. For this reason we encourage participants to answer at their soonest possible opportunity.