Meditation can be practised anywhere and you do not need to sit in any particular way or at all. Meditation requires oneself to be mindful of what we are doing, be it walking, painting or watching our breath, or concentrating on some scenery or picture.
Meditation helps us ground ourselves, and be present in the moment. It’s a way to free our minds from busy thoughts and conflicting emotions. There is no hard and fast rule as to how long one should meditate. Some people do it for 10 minutes every morning upon waking, or in the evening.
Of course, as we progress in the practice, we can go longer and deeper into our meditation.