How long for:
The earlier you sow them, the more germination rate you get...always the same rule, isn't true?
The Savage Garden says that highland seed can last a few weeks in the fridge, but the cool temps will kill lowland seed. Otherwise, all it says is, "very short lived." Good luck!
o//~ Livin' like a bug ain't easy / My old clothes don't seem to fit me /
I got little tiny bug feet / I don't really know what bugs eat /
Don't want no one steppin' on me / Now I'm sympathizin' with fleas /
Livin' like a bug ain't easy / Livin' like a bug ain't easy... o//~
gracilis is like bicalcarata, the seeds only stay viable for a couple of weeks. The other species should last much longer, but it does affect viability. Seeds of some species can last up to 2 years, but germination rates will often be poor.
Demystifying Nepenthes: http://www.nepenthesforeveryone.com