86-88 deg C is the internal target temperature. It does take a long time and when the meat stalls (as the connective tissue is breaking down) it feels like it’ll never get there, but then it speeds up, so be aware!
I did this a few times last year and was very pleased with the results – even better than pulled pork.
This is from the Pitt Cue book which I highly recommend if you want some inspiration and don’t mind adapting things so they’re not quite so complicated (their Big Ode burger requires smoking a whole brisket and a whole pork shoulder, making your own sausage, making your own pickles, making your own sauces and making the bun!)