It's up to the size of the snake, as its growth rate largely depends on frequency/size of meals. I'd guess at least a year, maaaybe two depending on those factors.

The general rule of thumb for enclosure sizes is, 1/2 the perimeter = the length of the snake. A slender, semi-arboreal snake like an Irian Jaya could stretch that a bit because it takes up less room and makes good use of the vertical space (if you provide climbing opportunities).

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