It really depends on your personal character. Some people are the type that can get very calm from Reflection, being more wisdom leading to tranquility types. Other people may find that if they do too much Reflection, they get agitated, so they need to calm the mind from time to time. To keep a balance, please don't forget walking meditation, because especially in a normal life the mind can get very involved in many things, and if we sit down straight away, there's a tendency for the mind to continue with that particular energy. Doing some walking meditation before you sit is very helpful, to wind the mind down, to bring it to the awareness of the body, so that you have a clearer object, getting a little bit more calm and tranquility in the mind before you sit.
The balance, I said, is very personal, but it's very helpful to do a bit of Reflection a day, a bit of Compassion and Lovingkindness meditation a day, and a bit of walking meditation a day, as well as bringing Mindfulness into your everyday life activities. As we want to bring more wisdom into our life, we prefer the path of wisdom leading to tranquility. Because it's safer in that we don't get attached to the tranquility of meditation and then just like it so much that we don't want to work the mind.
However if one has a busy life, one may have to do a little bit more awareness of the breathing depending on your lifestyle. It depends on yourself, but to experiment, and as far as the Reflections, if you happen to do a short form of the Reflections, then it's helpful to start out every formal period which you're going to do Reflection with the short form to get it moving a little, and then take one Reflection and expand it a little bit more.
Some people find that they start to see areas that need attention in their life. For example, if they're getting lost in a lot of planning mind, they might decide, "I'll do a short form of the Reflections, and then expand the Death Reflection more today to balance this tendency." But also don't forget the Awareness of the Breathing. Even if it is a little bit at the end of the short Reflections; do the short form of the Reflections and a bit of breathing, and then start to expand.
With the Compassion and Lovingkindness meditation, I don't think we can do too much of it. Perhaps do a whole Compassion and Lovingkindness in the evening, or in the morning. It can help to resolve the day much better. It can help us to flow with the people that we're with much easier, as well as understanding and expanding out to others in the world. Especially it helps to strengthen our compassionate motivation, because the motivation needs to be quite strong to keep our practice going in our everyday life.