CREATE TABLE table_64917 ("Rank" FLOAT, "Rowers" TEXT, "Country" TEXT, "Time" TEXT, "Notes" TEXT)

What were the notes for the time of 6:34.51?
SELECT "Notes" FROM table_64917 WHERE "Time" = '6:34.51'
SELECT "Notes" FROM "table_64917" WHERE "Time" = '6:34.51'