Whichever method you use should take only 7-14 days no matter what. If it takes longer you are doing it wrong or have the wrong strain, one you don't want to fuck with at all anyway. Your bottle of water with an airstone aquarium bubbler would have produced roots in 7-14 days. Stale stagnant water without oxygenation is NOT conducive to roots. Roots NEED oxygen. Again, the same caveat. This is the WRONG thread to discuss that topic.