RMJ are very slow growing.
That seems to me to be an unanswerable (with any validity) question, and therefore, rather pointless.
It does depend on where (climate, sunlight, wind, snow, ice, rainfall (including acid rain) ) you are growing them.
Also depends on:
Their overall health.
Where they're growing - field, grow box, training pot, bonsai pot.
How and how often they are fertilized.
Various cultural practices -- pruning, pinching, wiring, etc.
Health at any given time.
and probably many, many other conditions.
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