I was surprised – I soaked some Trader Joe’s raw almonds the same way I soaked the walnuts, an entire (4 cup) bag with plenty of water and with a tablespoon of salt. I was very surprised that perhaps 7 or 8 hours later, the almonds had actually started sprouting. (Recipes for sprouting call for a pinch of salt, not a tablespoon!)
I’m not finding perfect consensus here, and I’m going to assume that the amount of salt to add and how long to soak is slightly arbitrary. From The Nourishing Gourmet:
Raw Pecans, Walnuts, or Almonds: Soak 4 cups walnuts with 2 tsp salt for 7 hours or overnight. Dehydrate 12-24 hours, until crisp.