Every day you have to cook and eat. If you eat today, again tomorrow you feel hungry. If you eat in the morning, then again in the evening you feel hungry. You cannot eat just once and be done with it because the body has its own nature.
The same is with your mind. Entertainment is not enough once. Would you listen to me if I tell you that it is enough to watch only one movie in your lifetime? You need entertainment again and again.
Body needs nutrition again and again. To satisfy hunger we eat food. We drink water to quench thirst. We take rest when we are tired. In the same way, spirituality is also like that. To satisfy our spiritual hunger, we need to meditate again and again.