If a 1″ block of AL is heated by 1°F expands to 1.0000123″; how long will a 1″ x 12″ bar of the same material measure when heated by 800°F?

If a 1″ block of AL is heated by 1°F expands to 1.0000123″; how long will a 1″ x 12″ bar of the same material measure when heated by 800°F?