in teamcity-premerge-agent/src/main/java/jetbrains/buildServer/premerge/PremergeBranchSupportImpl.java [180:187]
public int getTimeout() {
int timeout = myConfig.getIdleTimeoutSeconds();
GitVersion version = myConfig.getGitVersion();
if(version.isLessThan(new GitVersion(1, 7, 1, 0))) {
timeout = 24 * 60 * 60; //24 hours
}
return timeout;
}