Brief Answer: Most probably 20 days to a month. Detailed Answer: Hello Welcome to Health Care Magic. My name is Dr Muhammad Ahmad & i will look into your problem. I have gone through your query and would try to help you in the best possible way. There is never a fixed expected time to make a call that patient will regain consciousness within this time.. Meningitis is a serious condition , though Bacterial version of it is more rapidly destructive and devastating but viral meningitis gets dangerous when it reaches a stage when a person starts losing consciousness and awareness.. Good News : Viral meningitis gives less permanent damage to brain compared to bacterial counterpart. Bad News: Most of the times virus isn t affected by drugs and there are few viruses which can not be diagnosed exactly using Lab diagnosis techniques. What now?: Patient should be kept under strict medical supervision with daily check up of neurological sign and responses and made a chart of them showing if they are improving or not. What to expect : Things will improve ..in some cases there is some permanent loss of brain function but other functions are recovered. How much time will it take: With proper care, Correct diagnosis, Good medicine , and no super added infection a month or two should be enough for a considerable recovery , Age and health condition of the body also plays a role in determining the speed of recovery. My opinion: In my opinion As the virus and toxic product is cleansed away from her brain and damaged structures rebuild them selves,in 20 days to a month ,you will see considerable improvement which will keep getting better with better medical and nursing care.. It will not be a single day process. Hope I have answered your query. If you have any further questions I will be happy to help. Wishing good health to your family member !!