Online communication between school and home. Online communication between home and school is the use of digital telecommunication to convey information and ideas between teachers, students, parents, and school administrators.
In more severe cases a coma may last for over five weeks, while some have lasted as long as several years. After this time, some patients gradually come out of the coma, some progress to a vegetative state, and others die. Some patients who have entered a vegetative state go on to regain a degree of awareness. Others remain in a vegetative state for years or even decades (the longest recorded period being 42 years). The outcome for coma and vegetative state depends on the cause, location, severity and extent of neurological damage.
People don't remember things from being in one, so it'd be like he just woke up from a dreamless sleep, with the world changed. I've heard that 21 years is the longest time anyone has spent in a coma and was fully recovered. A documented case of a woman who woke up from her come after 20 years. http://www.cbsnews.com/stories/2005/08/0... the longest i've heard of is like 13 years or something close to that. but i'm sure there's longer.