Well, the first germination I think I noticed was right around the 2 week mark, may of been 3... so just keep watchin em.. How are you doing yours? Mine were bagged, inside a tank, at 90-100 degrees...
I have mine in my lowland terrarium on a shelf about 8" below the lights. I didn't bag them since the tank maintains about 90-100% humidity. Unfortunately I'm having trouble keeping the temps up (they're in the 80-85 range at best), so I just ordered a stronger heat cable for it. I've read that some petiolaris dews can germinate at temps as low as 60, so this shouldn't be a major factor, but this is my first attempt at growing them, so I'm clueless. If they do grow, I'll set up a dedicated terrarium for them where I can give them better light. I got D. petiolaris x paradoxa and D. broomensis x ordensis (or the reverse, I'd have to check), so theoretically these shouldn't be too difficult to grow compared to some of the others.