Passage: Edward VI died on 6 July 1553, aged 15. His will ignored the Succession to the Crown Act 1543, excluded both Mary and Elizabeth from the succession, and instead declared as his heir Lady Jane Grey, granddaughter of Henry VIII's younger sister, Mary. Jane was proclaimed queen by the Privy Council, but her support quickly crumbled, and she was deposed after nine days. On 3 August 1553, Mary rode triumphantly into London, with Elizabeth at her side.

Question: How long did Lady Jane rule?
nine days