College flat is 10' x 10'; 100 square meters. I bought 2 and the flavor was really strong for a week. Once the oils dissolved in the rose, the scent disappeared exponentially. Yes, you can still smell it a few weeks later, but basically you should be able to smell the rose right away. I would say the smell filling the room lasted 1.5 weeks, 2 weeks at most. Wouldn't buy again due to short life but still smells nice.
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