Last 4-6 hours on average. This white is a stunner. The stimulation, focus, and energy are perfect for the morning and a mid-day pick me up. The color is like nothing we’ve seen with a white. The testers have already deemed this a top favorite for clean energy. Honorable mention with this particular White Vietnam is that it’s great for studying and keeping on task! Energy 10/10. Anxiety Relief 7/10. Focus 10/10. Sedation 2/10. Pain Relief 8/10.