If you receive “quota full” the survey is normally already full of respondents within the same target 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 varies 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.
For surveys that you receive a “quota full” message they do not count as completed surveys and no rewards are earned, as the information is not used.