They take a lot longer than 2 weeks to begin rooting, in my experience. But if you leave them in the water they'll root eventually.
As a side note, the babies will not have yellow leaf edges. This type of sansevieria reverts to an all-green variety when propped this way. If you want to keep the yellow edges, you have to prop them by letting them bud off the main root.
@inasaba@simon Spot on reply. I started a single cutting from my daughter's plant. It was at least four weeks before any roots developed. And yes, the resulting plant lost its yellow edge.
That I'm not sure, never started a succulent in water... If it looks like the tissue is waterlogged probably cut it, but if the callous is intact it might be fine...?
Oh, also if you have access to it, "cactus" soil mix will be the best
I never callus mine. I trim my overgrown ones with a wide "^” shape (upside down 'V'). I stick them in a jar of water like yours and let it face the sun. Occasionally refill the water and rinse if necessary -- sprouts roots like crazy and even further sprouts. Fun fact: they thrive in water!!
I’ve got some sitting in water in my kitchen that have been there for the past six months. They only started putting roots out after about four? It takes a long time!
During the fall-winter time usually it takes months to grow some poor roots on Sansevieria. And some types do this much slower than other in my expirience.
Actually right now I have one Kirkii leaf in water for 4 months, and still nothing.