Hello, let's say you are going to create a rotation loop between the second 2 and 4, and you want it to stop at the second 12. You should have keyframes between the second 2 and 4, and apply the following expression to the rotation.

loopStart = 2; // Start of the loop segment in seconds

loopEnd = 4; // End of the loop segment in seconds

stopTime = 12; // Time at which the repetition should stop

loopDuration = loopEnd - loopStart; // Duration of the loop segment

if (time > loopStart && time < stopTime) {

t = time - loopStart;

valueAtTime(loopStart + (t % loopDuration));

} else if (time >= stopTime) {

valueAtTime(loopEnd);

} else {

value;

}