CREATE TABLE table_72027 ("Name" TEXT, "Reign" FLOAT, "Days held" TEXT, "Location" TEXT, "Defenses" FLOAT)

What is the lowest defense a champion with 345 days held has?
SELECT MIN("Defenses") FROM table_72027 WHERE "Days held" = '345'
SELECT MIN("Defenses") FROM "table_72027" WHERE "Days held" = '345'