What length tiller extension is best in a Sunfish?

I would like to add a tiller extension with a universal joint to the tiller in the Sunfish I bought for my daughter. I attached a photograph of the boat so you can see how it is now. I am not too heart broken to remove the wood extension because it isn’t mahogany. I looked at one of the online shops and they show several lengths for the Sunfish and some telescoping ones(see screen capture below). What length is best and what is the preference between fixed and telescoping?
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