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The normal life of a dpf filter for cummins is 200,000 miles or 150,000 hours per cummins
as far as the regen goes there is a differential pressure sensor that looks at inlet pressure verus outlet pressure and if they stray beyond there set limits then the {acm) after treatment control module thinks the dpf is plugged and want to do a regen.
A big misktake people make is there are 3 parts to a aftertreatment system
1 doc diesel oxidiation catylast
2. dpf diesel particulate filter
3. scr
The first 2 work together to trap soot in the doc and the dpf catches the ash from a regen,the scr system uses the def fluid to reduce nox levels by using 2 sensor called the inlet and outlet nox sensors normal engine inet nox is around 145-200 ppm and outlet has to be 80% less if not then check engine light,derated engine and finally shutdown.
but excessive regen issues could be for several reason from a stuck inrange differential sensor,exhaust leak,or dpf plugged with ash.
the very worst thing you can do on these engine is too much idle time it will plug them faster than anything else.
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