How many more will die when we turn-tail and leave? Those 44 ppl killed in the market? they weren't killed because of the USA - they were killed because they were not FIGHTING the US; because they simply wanted to go about their lives. When we leave - think Viet Nam
To answer your question? How many more? As many as it takes.
“… the greatest detractor from high performance is fear: fear that you are not prepared, fear that you are in over your head, fear that you are not worthy, and ultimately, fear of failure. If you can eliminate that fear—not through arrogance or just wishing difficulties away, but through hard work and preparation—you will put yourself in an incredibly powerful position to take on the challenges you face" - Pete Carroll.