CREATE TABLE table_30429 ("Emperor" TEXT, "Heir" TEXT, "Relationship to emperor and status" TEXT, "Became heir" TEXT, "Ceased to be heir" TEXT, "Next in line" TEXT)

How many next in lines had heirs of Archduke Karl?
SELECT COUNT("Next in line") FROM table_30429 WHERE "Heir" = 'Archduke Karl'
SELECT COUNT("Next in line") FROM "table_30429" WHERE "Heir" = 'Archduke Karl'