How long does it take for someone to come out of a drug induced coma?

My GF has epilepsy and she had a grand mall seizure followed by a smaller seizure a few hours later. She was complaining of shortness of breath so I took her to ER. SHe then had another grand mall and they put her in a drug induced come and put a tube down her throat to get her more oxygen. This was on Thursday. They took her off the ventilator Saturday and allowed her to awaken. She seemed very irrational most of the time, just says "No" over and over again. (On Sunday) She just wants to sleep all the time. She is very irritable when she is kept awake. I am worried there may be brain damage and her neurologist says he didn't think so. She can be carry on a conversation with her best friend like normal, but just says no to me and her nurses. I am very confused and worried for her. They may release her in the next day or two if she responds well to her meds.