In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.

Passage: While still attending high school in Tokyo, Katsu began training professional wrestling at the dojo of the JWP Joshi Puroresu promotion. On January 20, 2011, she passed a traditional audition held in front of her trainers and JWP management and officially graduated to the main roster of the promotion, becoming its first ever member still in high school. Katsu made her debut on March 21, 2011, wrestling JWP Openweight Champion Leon to a draw in a five-minute "exhibition match". She made her "official" debut in Korakuen Hall on April 3, 2011, losing to Sendai Girls' Pro Wrestling representative Dash Chisako. On April 17, Katsu entered the J-1 Grand Prix 2011 and was defeated in her first round-robin match by masu-me. On May 22, she was defeated in her second match in the tournament by Sachie Abe. On June 12, Katsu was again defeated by masu-me, this time in a match to determine the number one contender to the JWP Junior and Princess of Pro-Wrestling Championships. Katsu won her first match on June 26, when she, Ebessan and Kaori Yoneyama defeated Gami, Kanjyuro Matsuyama and Kyusei Ninja Ranmaru, though she did not take part in the finish of the match. Katsu finally scored her first pinfall win on July 18, when she defeated freelancer Mika Iida in a singles match. On August 14, Katsu entered the annual Natsu Onna Kettei Tournament, but was eliminated in her first round match by Ice Ribbon representative Hikari Minami. On September 23, Katsu entered the Souseiseki Cup / Blue Star Cup round-robin tournament for rookies, defeating Ice Ribbon's Dorami Nagano in her first match. She followed that up by also defeating Aoi Yagami on October 10, Mexican wrestler Lady Afrodita on November 13, and masu-me on November 20. During the tournament, on October 16, Katsu also made her debut for Oz Academy, facing Nao Komatsu in a losing effort. On December 16, Katsu suffered her first loss in the tournament against Nana Kawasa, but still won her block to advance to the finals of the tournament. On December 23, Katsu defeated Rabbit Miu to win the 2011 Souseiseki Cup / Blue Star Cup tournament. The following day, Katsu was named JWP's rookie of the year. As a result of her tournament win, Katsu received a shot at the JWP Junior and Princess of Pro-Wrestling Championships on January 9, 2012, but was defeated by the defending champion, Osaka Joshi Pro Wrestling representative Sawako Shimono.
 Link Information: She made her debut under her real name on March 15, 2000 Answer: 11
How long had Leon been the JWP Openweight Champion when she had an exhibition match with Katsu?