Depends on how hot/dry/sunny where you keep them is, and I've noticed it can vary a bit by plant and also with the maturity of the plant. I have a shitload at home, now lining most of my windowsills (use them as natural blinds). Even though they're all propagated from the same plant (or 1 generation removed), they definitely aren't uniform in their growth and reactions to light/water.

I saw an uptick in growth and baby offshoots when I started watering a little less and started spraying them 1-2x/week with a fine mist. Have you tried spritzing them?