For my Brohemian Pilsner Recipe I do 62°c for 30 minutes, 68°C for 30 minutes and mash out at 75°c for 10 minutes.
Someone will no-doubt pop on and say it's unnecessary with today's highly modified malts yadda yadda yadda, but as I have a Grainfather, the patience and the ability to do step mashes, I do them because they make me feel all right and proper. Also, I've had good results.
That said you need to get the crush right and I pause the timer and resume it only when the temperature has been reached.
I'd highly recommend watching all of the David Heath Tips videos for Grainfather, he's by far the most informative brewer on YouTube when it comes to the Grainfather. He's also really kind when people ask him questions (He's no doubt answered a million times before).