In breathing and body scan practices, I am able to more or less quite able to concentrate. But in others like Altruism, Loving Kindness and others, Meditation is difficult for me. But , the thing here is, the more you practice, the better you become at controlling your thoughts. It doesn't matter for how long you are able to do it because for an untrained mind, thoughts will arise continuously. What matters is whether able to bring it back gently to your practise. It improves over time with consistent practice. Who knows, you might even become better than me in the rest of the practices! Haha !
Take Care. 😄