Nearing the end of my 3 month tourist visa in Vietnam. Planning on exiting vietnam, and returning again on a new tourist visa.

My question is whether it is safe for me to put in the application for the new tourist evisa while my current tourist evisa is still in effect and not expired yet. Or, do I need to wait until the day after my visa expires, then submit a new evisa application (which will take 7 days, forcing me to spend a week in another country while I wait to return).

My worry is that, if my visa expires on the 25th, and I submit a new visa application today (17th) designated to begin on the 26th, the application will be automatically rejected as an obvious visa run attempt.

Ideally, I want to apply for the new visa right now in advance, so I can leave and come back the same day when I have to.

Any experience or sources?