2 weeks is about right. This is how I do it in a nutshell. Had 100% on my last 3 clone batches of 25.
Take your cuttings from the lower half of your mother plant making sure she has had no nutes for 7 days.
Place them in your propergator or humidity dome. Spray the leaves with fresh water and cut the tips (30%) off.
Close your lid and stick them under 18/6 of cfl.
Do not open the lid for 4 days. Don't get impatient, keep it shut.
After 4 days, open the lid for 5 minutes and see if the leaves droop. If they do, spray them once and shut the lid. Repeat this every 2 days until the plants no longer droop after 5 minutes after you take the lid off. If the leaves do not drop then they have started putting out the start of roots. They no longer need the extra humidity.
Open your vents on the propergator permanently.
Until you see roots, Spray your rock wool cubes/jiffy pellets etc a few times with ph adjusted water every other day but don't soak them. This gives the roots something to aim for.
They key is the first four days. Don't open the bloody dome lol