CREATE TABLE table_22311 ("No." FLOAT, "#" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Canadian air date" TEXT, "U.S. air date" TEXT, "Production code" FLOAT, "Canadian viewers  ( million ) " TEXT)

What is the maximum number of episodes in the series listed?
SELECT MAX("No.") FROM table_22311
SELECT MAX("No.") FROM "table_22311"