CREATE TABLE table_1252 ("No. in series" TEXT, "No. Disc" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Length  ( minutes ) " FLOAT)

Name the total number of length minutes for number in series for 17
SELECT COUNT("Length (minutes)") FROM table_1252 WHERE "No. in series" = '17'
SELECT COUNT("Length (minutes)") FROM "table_1252" WHERE "No. in series" = '17'