Nabhi Kriya is one of the classical sets in Kundalini Yoga. It is a vigorous set and even in this set times were reduced. If you wish to make it even more challenging double the times. Here are the timings for advanced and really advanced! The first exercise on video = 5 minutes (10 minutes), 2nd = 2.5 minutes (5 minutes), 3rd (5 minutes), 4th = 7.5 minutes (15 minutes), fifth = 2 minutes (4 minutes) and 6th = 1.5 minutes (3 minutes). You will get very warm during this Kriya!