I bought a 3 meter Ficus tree with the idea to create multiple air layers and turn them into bonsai starters. Even with a very sloppy job the tree was eager to create roots. Its a very easy tree to propagate. 
No need to wait months. I did this end of Winter / Beginning Spring. Used Sphagnum moss, works 100% every time.
Results after 3 to 4 weeks.