My longest stall, just last week as a matter of fact while frustrating as all get out, yielded some very fine eating. Amazed me how good that pig was. It was 4 hours later than I had planned on it being done. To speed it along Pineywoods and Irishteabear talked me into foiling it and beating on it a tad. Really it didn't seem to help, in fact the temp of the meat dropped 5 full degrees. I assume this is because the cooler juices got jetted around bringing the average temp of them down a tad. Finally it finally started to move. Whew!! By this time Mrs. GnuBee had gone to bed. I sliced it at 190f, put it on a bun with some coleslaw. Out of nowhere Mrs. GnuBee appeared. Apparently alerted by the smacking of my lips as I tasted that wonderful Sammie.
Beating on it a tad is supposed to get the juices moving around the meat and speeding things up. I have had limited success with this method, however once when I turned it over and slammed it on the counter one time, It immediately sped up.
Like Piney said every piece is different. Some cruise along as if stalls never happen and others are surly as hell.
Also reading Piney's post made me wonder if the longest stalls are caused by the most connective tissue giving the best results. If so a stall might be something to cheer at instead of something to give the middle digit salute too. ????????????