my jamban's main vine is approximately 8-9" in diameter and about a foot long (although the vine has no support so it sprawls around. the photo shows a basal pitcher (the second leaf)
i've had my plant for 8 months now.
i dont know how soon the pitchers will start morphing, but the main vine does have the toilet shaped pitchers.
have fun with yours. it is by far my favorite nep in my collection.

@jim: the top layer is, however, in the pot is a good mix of 1:1:1 of orchid bark, perlite and LFS.