How Long Should I Continue Using Retin-A Before I Know Its Actually Working?

Hi. Ive been using Tretinoin .05% cream every night since the beginning of June. Its going on 7 weeks now and my skin is still broken out. Im wondering how long I should keep using this before I should give up and try something else. Ive read a ton of reviews that say an initial breakout is normal, but how long should it last?

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