CREATE TABLE table_8434 ("Number" TEXT, "Builder" TEXT, "Type" TEXT, "Date" FLOAT, "Length" TEXT, "Capacity" TEXT)

How many Dates have a Builder of laconia car company, and a Number of 63-68?
SELECT COUNT("Date") FROM table_8434 WHERE "Builder" = 'laconia car company' AND "Number" = '63-68'
SELECT COUNT("Date") FROM "table_8434" WHERE "Builder" = 'laconia car company' AND "Number" = '63-68'