CREATE TABLE table_73395 ("State  ( class ) " TEXT, "Vacator" TEXT, "Reason for change" TEXT, "Successor" TEXT, "Date of successors formal installation" TEXT)

What is the total number of dates of successor formal installation when the vacator was Joshua Clayton ( F )?
SELECT COUNT("Date of successors formal installation") FROM table_73395 WHERE "Vacator" = 'Joshua Clayton ( F )'
SELECT COUNT("Date of successors formal installation") FROM "table_73395" WHERE "Vacator" = 'Joshua Clayton ( F )'