CREATE TABLE table_34910 ("Version" TEXT, "Length" TEXT, "Album" TEXT, "Remixed by" TEXT, "Year" FLOAT)

How long was the instrumental version in 1986?
SELECT "Length" FROM table_34910 WHERE "Year" = '1986' AND "Version" = 'instrumental'
SELECT "Length" FROM "table_34910" WHERE "Version" = 'instrumental' AND "Year" = '1986'