What is the length of the long interval that causes one to miss the complete reward of the prescribed remembrances (adhkar) after the obligatory prayer, and is it estimated by an hour, a quarter of an hour, or minutes?

Knowing a long interval before reciting the remembrances (dhikr) of prayer is referred back to common practice (urf). So, what people consider long in their common practice is considered long, since its duration has not been specified in the Shariah by a defined time period. Some scholars have held that, for example, the passage of an hour is considered a long interval.