Hi Ken
All joking aside, the calf is a very unusual muscle. It has twice the muscle density of other muscles in the body. It is very strong.
The problem with most muscles it that if we don't use the full range of moverment, the tendons at the ends of the muscle get shorter.
So a normal life of walking, sitting in the chair and driving will lead to shortening of the tendons.
So if you do over stretch, the muscles will tear.
Your calves will probably hurt for longer than two weeks, but you can still exercise them.
Once mended, you need to get into the habit of stretching your calf muscles. A little at first then gradually more.
This only takes two minutes tops, and it will help prevent further injury.
If you don't know how to stretch then go down your local sports/lesiure centre and go to the gym/wieghts room. You only need to go once.
Tell the instructor what yur problems and ask then for advice on what you can do at home. Much cheaper than a physio, which you don't really need.
So hop down the gym when you feel better