Where can I find a weatherproof while in use cover long enough to fit a big in line gfci box..?. its for my hot tub...

I doubt you'll find one for something that big, but if it exists a real electrical supply house will either have it or can get it.

Inline GFCI box? You mean on the cord? They are already waterproof.

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Originally Posted by Missouri Bound

Inline GFCI box? You mean on the cord? They are already waterproof.

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IF it is being plugged in outdoors the cover would need to be an in-use type.
I can't think of any that would fit one of those GFCI male cord ends.

You may want to try a greenhouse supplier. ​They have specialty items which must be waterproof because of the nature of the application.