If there is axonotemesis (nerve is injured but myelin sheath is intact), the nerve will regrow down the intact sheath at about one inch per month. Since the muscle’s nerve point is at the top and middle of the muscle, measure from your incision to the midpoint of your calf. That (in inches) is how long the muscle will take to regrow with one-inch-per-month formula. If the distance is greater than 18 inches, your muscle may not fully recover as 18 months is the time it takes for the muscle cell to scar over.
It is also possible that you have neurotemesis where the entire nerve cell and myelin sheath are both injured in which case, there will be no healing. There is no way to tell with our current measurement tools. Give it time and allow nerve budding and hypertrophy to work. There is no easy answer but surgery in the face of weakness sooner than later is recommended.
See: https://neckandback.com/lower-back/#:~:text=How%20Muscles%20Recover%20from%20Nerve%20Injuries
https://neckandback.com/lower-back/#:~:text=Nerve%20Damage%20%26%20Healing
Dr. Corenman
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.