According to Osho, impatience is the shadow of desire: when practice is driven by wanting results—peace, silence, enlightenment—the very desiring agitates the mind. The cure is not a new spiritual aim, but seeing that desiring itself is the problem. Drop goal-seeking, wait without hurry, and let meditation happen in desirelessness; then patience and stillness arise naturally.
Stop wanting something from meditation; just sit without trying, and patience comes by itself.