In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Trees can also be air layered but air layering usually takes four to _ months to be successful.
[EX A]: six

[EX Q]: Interstate commerce is commerce conducted in at least _ states.
[EX A]: two

[EX Q]: Bees have sentinels, gobies sentinel their nests for from six to _ days.
[EX A]:
nine