Quote from Meriwhen
I believe that in most states, you have a 30-day grace period to practice with an out-of-state license. After that period ends you need to have your local license in hand or you'll be running afoul of the law. So IMO, get started on the license endorsement process now.
I know of no states (other than compact states) that allow any sort of 'grace period' to practice with an out of state license. Many states do offer a temporary permit while an application for endorsement is being processed but it requires the application actually be filed.
To the OP, the only entity that can really answer your questions is the Virginia Board of Nursing. In my experience (with other BoNs) you'll want to start the process sooner rather than later. Here is a link to their applications (you'll be doing the LPN or RN licensure by endorsement) http://www.dhp.state.va.us/nursing/nursing_forms.htm