More than two weeks following F1 racing star Michael Schumacher being placed in a coma for the skiing accident, a few news outlets are speculating when and if the driving legend will wake up.

The hospital where Michael Schumacher has been confined while under a coma since Dec. 29 has not disclosed an update on the racer's condition in the previous week. The legendary driver was listed as "stable but not critical" at a medical institution in Grenoble, France.

Schumacher remains in an artificially-induced coma, but some German media outlets have reported that prolonged comas result to significant health challenges, according to doctors.

The 45-year-old has been in a coma after a skiing accident in the French Alps on Dec. 29.

"The sooner an artificial coma ends, the faster return usually normal body functions such as breathing," claimed Institute for Emergency Medicine director Heinz Peter Moecke.

The medical expert said patients are typically kept in a coma for a few days or at most, one or two weeks because he could experience problems such as intense swelling in the brain or liver damage due to the medication.

The media outlet also says there has been no announced plan to awaken Michael Schumacher from the coma because the injuries he received were too severe.

Andreas Zieger, a German neurosurgeon from Oldenburg, warned against speculation because the specifics of the racing legend's injuries sustained from his skiing accident were not disclosed.

"Brain injuries are among the most complicated injuries that can happen to the human body," the doctor said in an interview. "Therefore individual predictions about the course and potential complications cannot in all cases (be) reliable."