Why does god allow the plagues to go on so long?

The plagues in the biblical narrative often serve as a means to demonstrate God's power and to compel Pharaoh and the Egyptians to acknowledge Him. By extending the duration of the plagues, God provides multiple opportunities for repentance and reflection, emphasizing the consequences of hard-heartedness. Additionally, the prolonged suffering highlights the severity of disobedience and sets the stage for the eventual deliverance of the Israelites, showcasing God's sovereignty and commitment to justice.