After 3 months of high pressure length pumping......
I have been interval pumping slowly, from 13 inHg to 15 in Hg, for 30 minutes, 2 sessions in a day. My intervals lasts 1-2 minutes before losing the vacuum and immediately pumping back to 15 inHg. No sets, just one long session up to 30 minutes without breaks.
I have been pumping very inconsistently for few years now, occasionally up to 25 inHg which made my tunica tougher with few nasty blood blisters. (Not recommended!!) My current setup, Leluv electronic handle, silicone toe ring at frenulum and base, LA Pump's mushroom maker pump and Oxyball Juicy pump ring. Pumping without the later also gave me mold varicocele.
After 3 months, I have gained 0.4" in length. Zero girth gains and almost tanked my EQ. In fact, had to stop all pumping for nearly 3 weeks before I started pumping to 11 inHg again. Not other length focused PE, just pumping. Measurement was made after 4 days of no pumping. Sorry but I can't be coerced to post my nude pics lol!!
Other than tanking my EQ, my member is noticably darker, many petechiae just below the coronal ridges, sharp pain in frenulum and even my glans grew darker.
I have penis extenders or hanging to be very boring, hence the pump. Definitely not recommended for newbies but high pressure pumping works for length.