If a user currently has a featured listing that has 3 days featured, and 7 days non-feature left. He will be on vacation for the following 2 weeks starting tomorrow and he decided to extend the duration using a regular 30 days plan now. How can he do that without losing the remaining 3 days featured?

Because if he goes ahead and update plan to the 30 days plan. He will lose the remaining 3 days featured, the listing will be changed to none-feature. Should featured duration and regular duration count separately

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