It depends on the circumstances. If you took all necessary and reasonable steps to keep the parts of your case you were responsible for up to date, then a lawyer may quite likely be able to take full carriage of your file under a full retainer.
However, if you did not, then considerable time will be required to rectify the course of your proceeding. Under these circumstances, a full retainer depends on the lawyer’s ability and availability to provide full legal representation competently and efficiently.