“Eternity is not an unending succession of days in the calendar, but something more like the supreme moment of satisfaction, in which totality embraces us and we embrace totality. It would be like plunging into the ocean of infinite love, a moment in which time—the before and after—no longer exists. We can only attempt to grasp the idea that such a moment is life in the full sense, a plunging ever anew into the vastness of being.” (1)

Look around. The world seems complete. It seems, God has already finished the creation cycle and we are on this earth to be born, grow old and finally die to go to heaven. We have a limited window of time to accomplish earthly goals, but our main concern should be obtaining the eternal life. How can we make the most of our journey on earth? The answer is actually quite simple. We need to live in the moment.

Once we enter eternity, there is no past or present. We enter into the dimension of God, the one who is constant and never changes. Looking closely, there is a similarity between our time on earth and our time to be spent in eternity. Our earthly time is divided into the past, the present, and the future. The past is gone, and the future does not exist yet. The only true time will inhabit is the present, and that is the definition of eternity: a continuous present.  

Simply, the present is eternity, so eternity is now. We live in a continuous moment. Our only door to God is the present. Eternity may seem far away, but it is right here. We can either use it or lose it. Our present time is “the heroic minute.” When we do what we must do! without second thoughts. 

Keep in mind that if we do not organize this time, we are moved only by feelings and waste this time we undo the world, we pollute it. 
Whoever does not gather with me scatters” (2). The only way to serve God and gain eternity is working in a continuously present moment in the created world for the eternal one. 
The concrete way of making a good use of our time is doing what needs to be done in the right moment.  Do not give in to distractions. Be convinced that there is no one else who can do what you can. Even though time seems as though it is non-existent, it is in fact the tool that we have to go to heaven.
(1) http://w2.vatican.va/content/benedict-xvi/en/encyclicals/documents/hf_ben-xvi_enc_20071130_spe-salvi.html
(2) Lk. 11:23