interesting. I have been causually messing around with wbtb times when i WILD. It has been extremly difficult though cause of my unsteady sleep schedual. however back when i did have a steady sleep schedual i would do 4 - 4 1/2 hour wbtbs. and i had some of my most successful WILDs from those times. Come to think of it, my shortest WILD (took around 3-5 min.) from the 4 hour wbtb mark.

my sleep schedual is FINALLY starting to straighten out, so i might try this with you, in the next couple weeks.