CREATE TABLE table_79212 ("Actor" TEXT, "Character" TEXT, "Soap Opera" TEXT, "Years" TEXT, "Duration" TEXT)

What character was portrayed by the same actor for 12 years on Neighbours?
SELECT "Character" FROM table_79212 WHERE "Duration" = '12 years' AND "Soap Opera" = 'neighbours'
SELECT "Character" FROM "table_79212" WHERE "Duration" = '12 years' AND "Soap Opera" = 'neighbours'