CREATE TABLE table_62907 ("Rank" FLOAT, "Actor" TEXT, "Character" TEXT, "Soap Opera" TEXT, "Years" TEXT, "Duration" TEXT)

What are the years for Eileen Derbyshire with a duration of 52 years?
SELECT "Years" FROM table_62907 WHERE "Duration" = '52 years' AND "Actor" = 'eileen derbyshire'
SELECT "Years" FROM "table_62907" WHERE "Actor" = 'eileen derbyshire' AND "Duration" = '52 years'