The length of time an aggregate remains in the dryer drum is known as the dwell time.

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Dwell time describes how long aggregate stays in the dryer drum as it is heated and dried. In an asphalt plant, the material enters the rotary drum, is heated to remove moisture, and then exits after a certain period. This time in the drum is what researchers and operators refer to when talking about dwell time, and it’s the standard term used in practice for this stage of drying. Other terms might describe similar ideas in different fields, but they aren’t the conventional wording for the drying process in a drum. If dwell time is too short, moisture may not be fully removed and the mix can be unstable; if it’s too long, energy is wasted and the material may overheat.