CREATE TABLE table_29297 ("Episode No. Episode No. refers to the episodes number in the overall series ,  whereas Series No. refers to the episodes number in this particular series." FLOAT, "Series No." FLOAT, "Episode" TEXT, "Director" TEXT, "Writer ( s ) " TEXT, "Original airdate" TEXT)

How many times did episode 17 originally air?
SELECT COUNT("Original airdate") FROM table_29297 WHERE "Episode No. Episode No. refers to the episodes number in the overall series, whereas Series No. refers to the episodes number in this particular series." = '17'
SELECT COUNT("Original airdate") FROM "table_29297" WHERE "Episode No. Episode No. refers to the episodes number in the overall series, whereas Series No. refers to the episodes number in this particular series." = '17'