This is just another data point for regen operation.
After letting my MT240 warm up a couple minutes last night the regen light came on and the temp had barely moved off C which was unusual. It did reach normal temp in a few more minutes and that's when it did the RPM variation which meant it needed to run higher RPM than the 1600 I had it at to regen, so I nudged the throttle up to 1800 and then the High temp warning light came on, this was at 176.7 hrs. I continued the work and at 176.9 hrs the lights went off in usual sequence first the high temp then a minute or so later the regen light. That was a regen in only 12 minutes, the quickest yet, usually they take closer to 20 minutes.