Duration to first dormancy in Amorph. titanum

Aroiders,

how long does it (normally) take to go into it's first dormancy for an Amorph. 
titanum seedling?
Or in other words, how big is the tuber normally at that time or how many leafs 
has the plant made till then?

I grow an Amorph. titanum, just making it's 3rd leaf (about 20 cm high (approx. 
8 inch) and about 9 mm (approx. 1/3 of an inch) in diameter at the base of the 
petiole) and wonder how long it will grow on and on making one leaf after 
anonther before going to sleep.

Any suggestion or experience wellcome.

Thanks,
Bernhard.
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