While looking at the August 22-28 and August 29-September 4 GSN advanced schedules very closely, I now notice GSN will only air one new episode of Idiotest a week.
The new episode will air Tuesday at 10pm ET and a rerun at 10:30pm ET. Since April, two new episodes of Idiotest have aired at 10pm and 10:30pm ET.
Through and including August 2nd, 35 of 40 episodes of Idiotest have aired for this season. At this rate, with five episodes remaining, Idiotest will conclude on Tuesday, September 20th.
GSN must like Idiotest ratings enough to keep new episodes around longer. GSN does not have much else to advertise and focus on until Hellevator and Window Warriors premiere in October and November, respectively.
It is good news for Idiotest that GSN is extending the new episodes out as long as possible. At least new episodes of Idiotest are not getting the Winsanity treatment (Idiotest does not get prime slots taken away like Winsanity).