Ok, so I just did another test, this time with the vanes fully closed and using the faster speed Ilford MGIV. No fogging at all up to 7 minutes. For those that haven't bothered looking at Kodak's instructions, the paper is exposed to the safelight in steps of 1, 2, and 4 minutes, creating 1, 3, and 7 minutes patches. I may try another one later that is 5, 10, and 20 minutes (5, 15, 35 minutes total), but since that means standing in my darkroom with nothing to do for more than a half an hour, I am not enthusiastic about trying it.