Till one of three things happened. 1. The user runs out of Chakra. 2: the leaves or petals get disovled some kind of way. (i.e fire) and 3 The user wanders outside the are of effect of the petals which is of course a very small area to work with.(i.e. The storm of blossoms does not follow the user.)
I hope this is accetpable as a response.