CREATE TABLE table_78659 ("Season" FLOAT, "Average Attendance Home" FLOAT, "Highest Attendance Home" CLOB, "Average Attendance Away" FLOAT, "Highest Attendance Away" CLOB, "Division / Section" CLOB, "Level" CLOB, "Average Attendance League" FLOAT)

How many season have an average attendance league of 2.456?
SELECT SUM("Season") FROM table_78659 WHERE "Average Attendance League" = '2.456'
SELECT SUM("Season") FROM "table_78659" WHERE "Average Attendance League" = '2.456'