The battle lasted until six or seven in the evening, taking a full four to five hours to wrap up.
This was already remarkably fast. If they were facing the major hidden villages of the Five Great Nations, finishing a battle this quickly would be completely impossible. Furthermore, this was achieved under the strict precondition of not harming civilians, which clearly demonstrated a high level of efficiency.
If someone fought like Pain did when he attacked Konoha, what would even happen? He had come to liberate the common people, not to slaughter villages and destroy nations.
Chapter 176