CREATE TABLE table_26047 ("Years led" CLOB, "Span of years led" FLOAT, "Player" CLOB, "Titles won at point of lead" FLOAT, "Total Career titles" FLOAT, "Tournament at which lead began" CLOB)

Of the players whose lead began at the australian championships, what was the shortest span of years led?
SELECT MIN("Span of years led") FROM table_26047 WHERE "Tournament at which lead began" = 'Australian Championships'
SELECT MIN("Span of years led") FROM "table_26047" WHERE "Tournament at which lead began" = 'Australian Championships'