A relative of mine suffered quite a severe stroke, but with physiotherapy and lots of care back at home, he recovered enough to apply for his disabled licence after a year. He took a new test of some sort, and is now back behind the wheel of his modified care. However, a lady I know also had a slight stroke, and she was driving again within a few weeks. I'd think it was up to the the doctor or the hospital specialist as to when a person was deemed fit enough to get behind the wheel again.