There are no hard and fast rules about recovery and improvement. Many start improving at one year because they finally start giving their brain quiet rest. Some delay their improvement by putting too much effort into active therapies. Finding that level of activity that does not cause over-stimulation is important. Also, gently treating upper neck injuries that often are the cause of head aches and occipital neuralgia.

So, you should not fixate on stated time lines. Everyone is different.