From what I remember, you stay in P1 until goal weight. You stay in P2 for two weeks, where you continue to lose. Then, you stay in P3 for about two weeks, where you basically put back on what you lost in P2, which puts you back at your goal weight at the end of P1. Going from P1 to P2 helps you transition into choosing healthy foods since you’re not relying on the packets as much. If eating packets is easier (it was for me), there’s a ton of protein bar/shake options at Wal-Mart and other places that are inexpensive. Just watch that they’re not super high in fat/carbs/calories.