In RotJ, we can observe Han Solo suffering from an extended period of temporary blindness after at least half a year in carbon freeze.
In the Clone Wars, however, we see in this clip that they recovered almost immediately, although they probably only were in hibernation for one hyperspace jump.
How do the effects of hibernation sickness change over time, as a person spends a longer duration frozen, in terms of the known effects suffered and their intensity and duration?
According to the (new) novelisation of Return of the Jedi, the major symptoms of hibernation sickness are;
It also mentions that death can occasionally occur.
Since a common side effect was death, Solo is lucky to have only exhaustion, weakness, dehydration, dizziness, memory loss, and blindness.
This accords with what we see in the film series, albeit we should probably append the word "temporary" onto all of the symptoms (other than death) and yes, the length of time in hibernation does seem to impact on the severity of the symptoms.
