There are several VAG engines that have DPFs, that due to other differences won't necessarily work the same as each other. Also, there are two different regeneration processes that can happen, the passive and the active. The passive one is fairly transparent to the driver, and if it completes successfully and the parameters are met (from the DPF's differential pressure sensor) the more aggressive active one won't be triggered. How long in between and which type is wildly variable based on the driving situation. There is no one-size-fits-all scenario. SCR-equipped engines can run leaner more often, and thus use less fuel and produce less soot and therefor won't require as much regenerations to occur. The CKRA, CVCA, and CRUA (as well as all the V6s) have SCR. The CBEA and CJAA do not. The CBEA/CJAA have both low and high pressure EGR, but only the low pressure is run through a cooler. The CKRA has both its EGR cooled, but the high pressure one is directly through the cylinder head. The CVCA/CRUA are similar to the CKRA, but those also add in a variable intake camshaft. The CBEA/CJAA have twin path intake runners, the CKRA does not, and the CVCA/CRUA have an entirely different intake setup altogether, although it does use coolant for direct charge air temp control like the CKRA does.
Lots of differences in these engines, means they work a little differently from one another.
