Recipe asking for vanilla beans, question

So I plan on making some infused liquor as wedding favors and I came across this recipe:

BANANA/VANILLA RUM

INGREDIENTS:

1 1.75L bottle good dark rum

1 extra (empty) 1.75L bottle

5 cups water

1 cup light brown sugar

2 vanilla beans, split and cut in half

2 ripe bananas, halved and split, the long way, in quarters (so they will fit in the bottles)

DIRECTIONS:

Heat, sugar & split/halved vanilla beans in the water, stirring constantly, just until all the sugar is dissolved.

I heat it til it just reaches a light simmer.

Allow mixture to cool.

Split the rum equally between the two 1.75L bottles.

Split the Vanilla/Sugar mixture equally and add to the bottles.

(make sure you add the vanilla beans and any seeds to the rum bottles!)

Add one of the prepared bananas to each bottle.

..... My question is does the size of the vanilla beans matter? Is there a good length I should consider? I don't want it to not be enough and then on the flip side overpower it either.

submitted by /u/anewvogue
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