CREATE TABLE table_3688 ("Rank" FLOAT, "Rider" TEXT, "Sat 21 Aug" TEXT, "Mon 23 Aug" TEXT, "Tues 24 Aug" TEXT, "Wed 25 Aug" TEXT, "Thurs 26 Aug" TEXT, "Fri 27 Aug" TEXT, "Sat 28 Aug" TEXT)

What was the time on Monday August 23rd for Steve Linsdell 499cc royal enfield seeley?
SELECT "Mon 23 Aug" FROM table_3688 WHERE "Rider" = 'Steve Linsdell 499cc Royal Enfield Seeley'
SELECT "Mon 23 Aug" FROM "table_3688" WHERE "Rider" = 'Steve Linsdell 499cc Royal Enfield Seeley'