This is sunburn in the plant world. The yellowing leaves will fall off, there's nothing to be done about that. The plants themselves should have no major problems, and will put out new leaves. Some of the vine tips may die, too. It may take a year or more to look like nothing ever happened to it, but it will get there. I have a hoya that goes out in the summer and I have to wait until June when the trees have leafed out so I have shade. And I live in cloudy, rainy, yucky New York! Florida sun may be too much for any hoya, and certainly hours of direct sun are! But don't worry, you didn't kill them. How long have you had them? What kind of hoya? How big are they?

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may God bless the WHOLE world!

Those are beautiful hoyas you have! I think mine just couldn't handle the Florida sun. It's like being at the equator right now! I brought mine indoors for now, they are hanging in a window until it cools down a bit, or until I build a little greenhouse for them.

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Jessie