How often does Verizon Wireless update my usage?

Just wondering if anyone knows how often verizon wireless updates myverizon accounts. Specifically the my usage section. Thanks|||Usually every half hour or so, like if you are looking to see how many minutes you have used, when you log in it'll tell you how many minutes and at what time they last calculated it, if ever in doubt about minute usage dial #646 from your cell phone and they will send you a free txt message with your usage to your phone.