DEF re-gen cycle frequency

A Cummins rep responded to an email inquiry I submitted and confirmed what most of you have already explained to me. At least as far as my particular ISL engine is concerned, the re-gen process is usually passive, meaning it takes place without the operator's knowledge. The only time the operator may be alerted is when the engine is operated frequently at low speeds. Since most of my driving is interstate, it is unlikely I would ever know a re-gen is happening.

Thank you all for your replies.