2-month longer / 2 months longer

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French (France) - Urdu
Hi all!

I am writing an online survey where respondents are asked to pick up one answer from a list of possible options, as follows:

Duration of therapeutic effect

  • [*=1]1 month longer than drug X
    [*=1]2 months longer than drug X

I am unsure of the correct way to write the length of improvement - should it be "2-month longer than", "2 months longer than", or even "2 months' longer than"? I would tend to go with "2-month" but I have a doubt. Any advice?

Thank you! :)
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