Mostly i do break in and 1 race with the original conrod.
After that i change them around 6 litres.
The plus engines have such a pinch it's smart to change the first conrod earlier because of break in.

Some people change the conrod and keep it for break in of another engine.
I think that's really risky because you change the conrod of the heavy load it had during break in and then you going to re use it?.
Plus it already is worn in on the other crank pin.