I sent an email back to Mark Fly (UT professor putting out the survey) a few days ago inquiring about the Qty of surveys they had received back in the last few weeks.
Here is his response:
We have gotten a steady number of surveys in recently. We should have about 300 or so when we get back the surveys we gave out over the fourth, etc. 300 is a pretty good number to work with.
Thanks again for you interest.
Just thought I would pass it along.