Countries with a long average working time are more economically successful than those countries which do not have a long working time. To what extend do you agree or disagree?
The verb develop may be in the wrong form after the preposition to. Consider changing it to the gerund form.
The sentence is missing part of the not only ... but also construction. Consider adding the missing word(s).
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Your opinion
Don’t put your opinion unless you are asked to give it.
If the question asks what you think, you MUST give your opinion to get a good score.
Don’t leave your opinion until the conclusion.
Here are examples of instructions that require you to give your opinion:
...do you agree or disagree?...do you think...?...your opinion...?