…I was having slow results with that method too, but better than some clonex+perllite cuttings I did.
The big lesson this year on cloning for me is: healthy, vegging mother. My last cuttings + water gave 100% rooted in <15 days. I also kept the temperatures mid-70sF and elevated them with no thermal contact(wire mesh table).
Covered(my "dome is just a clear rubbermaid bin) for the first day or 2 or 3.
6’ from a single 15w SIL(weeeeaaaak light).
So… I attribute this last batch’s speedy success to: mom & temps.
As they rooted & got transplanted I gave them some refracted sunlight in the bathroom. Very likely gave them a needed boost.