from personal experience I can say, it takes two years

in this example, Air Layer propagation

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Phenomenal roots. It appears that you airlayed on tender growth. I have put a bunch of airlayers on l year old woody growth and at six weeks all they have done is produced calluses. If you happen to check this post I would love to for you to give us a step by step on how you did it. I too am trying to start cuttings for rootstock.

Alcedo passed away late last year. A loss for those who admire his skills and knowledge.

Thank you for letting me know. May God grant him eternal rest.