Board Thread:General discussion/@comment-94.172.132.51-20130124172634/@comment-90.231.216.195-20130124182321

I think it's closer to 5 seconds. If you deplete all of the charges (you'll notice among your buffs the icon for the passive changes colors when you attack until it disappears entirely) it'll take about a second, maybe two, before you start building up charges again.