I’m in Mexico with raw food experts, Angela Stokes and Matt Monarch, so I pulled them aside and asked them how often they eat and if food combining is a good idea.  The duration between two meals depend on what you have eaten. If it's quite digestive say vegetable juice, then you may feel like having something to eat after 15-20 minutes. But, if you eat heavy foods like nuts, you may want to eat after 6 hours. So, eat whenever you feel like hungry. Angela says that if you are physically hungry, go to have something to eat. But, if your mind is hungry, don't eat. Food combining is a good idea. All raw food combines well if you eat small amounts. You should be cautious when you are combining cooked foods like animal proteins with starches. It's a fermentation disaster. Again, fruit and other cooked food is also not a good combination.