Has there been a historic precedent of a quad surgery returning to full fitness and peak performance in 3 months?
As I understand it yes.
Just as an ACL injury can be cured in 2 weeks (ie very minor) whilst others (more serious) can take 9 months or more. Injuries are individual and can be 'cured' in a wide range of time depending upon the precise nature of injury, individual injured (some people seem to heal more quickly than others) ...... and some people recover form more quickly than others.
That's why medics are reticent for many injuries to give return dates as until heaking process is well underway return time is very uncertain - and as we saw with Kudus, the healing might come to an end as it wasn't as straight forward an injury as first thought so went from 'back next week' just before Roberto joined to 'back sometime' a few months later.
