How many altars did Abraham build for God?

Abram/Abraham built four altars. The first was at Sichem(Shechem) on the plain of Moreh (Genesis 12:6-7). The second was at Bethel between Bethel and Hai(Ai) (Genesis 12:8). The third was on the Plain of Mamre (Genesis 13:18) and the final one was built at Jehovah Jireh, the place that would later become the mount on which Jebus/Jerusalem were built (Genesis 22:9-14).