CREATE TABLE table_421 ("Symbol" TEXT, "Description" TEXT, "Success" TEXT, "Date of completion" TEXT, "Deadline for completion" TEXT)

what is the total number of deadline for completion where description is facebook becomes a publicly traded company
SELECT COUNT("Deadline for completion") FROM table_421 WHERE "Description" = 'Facebook becomes a publicly traded company'
SELECT COUNT("Deadline for completion") FROM "table_421" WHERE "Description" = 'Facebook becomes a publicly traded company'