Consistently....
about the last 22+ years.
In fact I still have one Nep. hybrid in particular... got it about 1990 or so*... (give or take a couple years)... along with my first Ceph and some other nice C.P.'s... and have had it (the Nep.) ever since! Still going strong, in spite of nearly killing it a couple times! (Last time was by "improving" my lighting system!)
Even used to sell rooted cuttings to some well known (but older) distributors.
Also used to throw away yards of vine, knowing no one who was into CP's at that time!
*Getting some real nice plants from a great guy who was liquidating his collection, really kept my interest going strons and it never waned since.
Before that, my interest and growing of them was on and off, mostly with other plants and things getting in the way from time to time over the years...
Started growing CP's when I was about 14 y.o. or so... so since about 1969 or '70.
(Went on to working in a plant store at 16 and got into growing and learning about other plants from there.)
Kept on with CP's from there till about '79 or '80 (got married and all that, along with interest in other things equally wonderful), and then on and off from about '82 till about '88 or '89 (Normal/common VFT's/Sarrs/Dews). That is about when I got my first Nep.* and other plants not long there-after, growing and expanding my collection and experience ever since.
Overall, proof that for some of us, once the CP love bug bites you, you stay bitten!
Meeting others into the hobby has been a real blessing ....
for the most part!
Have met a handful of wonderful and knowledgeable people, along with many others who also love growing CP's.
As was mentioned, time flies!