In wick-watered containers, I change water once a week. If any cutting develops signs of rot, such as mold, I remove it immediately. Don't fertilize cuttings You should only feed plants that are in active growth anyway, and we want our cuttings to concentrate on growing roots. As roots do begin to form fertilizer, or a lack of sterility will become less harmful. I once read that rhododendrons take two years to root.
Some houseplants start rooting in three weeks.
A more average time is three to four months. If light is dim and temperatures are lower, it will take longer, but roots can still be very healthy. I once rooted rose cuttings in six months in a cold, north-facing back bedroom. I rooted Rosemary under bright fluorescents in summer in six weeks. Both the roses and the rosemary thrived.