The most dice aligned to the same number in 30 seconds (blindfolded) is 18 and was achieved by Dinesh Shivnath Upadhyaya (India), in Mumbai, India, on 16 September 2013.

This record was broken on the Guinness World Record Challengers site (Challengers’ tag: UPADHYAYADINESH): http://challengers.guinnessworldrecords.com/challenges/289-most-dice-aligned-to-the-same-number-in-30-seconds-blindfolded/attempts/4338