RemainingDurationInIntervals field reflects the remaining number of billing intervals to which the discoill be applied. Therefodre, the expected behaviour is for this number to decrease for each billing cycle interval until it reaches 0 when the discount duration limit has elapsed.
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Hey @Mohamed_Mohamed, are you noticing this on test charges or live charges?
If test charges, this would be expected.
Related recent post here: AppSubscription object is not updated when the discount duration limit is reached - #2 by KyleG-Shopify