At 18-20 minutes, these are the largest and longest lasting Spiral Sounds rainsticks we offer. Because of their extra long flow time, the XL Rainsticks are the optimum sleep aid and/or meditation tool. Unplug and rest. Let the rainstick flow and help you reset. An XL Collapsible or Geometric Stand is recommended. We also make XL Carrying Bags if you wish to take your XL Rainstick out for an adventure.