With stock lighting, my low-light plants are growing slowly. I've only had my tank for ~3 months, but I've seen:
Anubias - ~1 new leaf every few weeks
Anacharis - growing, but stems are thinner than from the store
Wistera - a new node every 2 or so weeks (could be temperature related as well- it grew faster when at 80*, but I've since knocked it down to 76*)
My photoperiod during the day/evening is split with 5 hours on, 3 hours off, then 4 hours on. I randomly dose a drop of Flourish Comprehensive and stock a betta and a ghost shrimp.