There is no time limit to dissolving Voluma, or any other of the the hyaluronic acid fillers. As long as there is some unwanted product present, it can be dissolved with hyaluronidase. The main possible side effects from having Voluma dissolved would be those associated with any injection. So, I would say it would be possible to have some bruising with the treatment.
Fillers made of hyaluronic acid that haven't been metabolized by the body yet or haven't dissolved yet can always be dissolved with hyaluronidase. Please contact a qualified provider or a board-certified physician with extensive experience in these procedures. Hyaluronidase is designed to dissolve fillers made of hyaluronic acid. Minor bruising, swelling, and discoloration to a degree are normal.