This would seem the place to begin any commitment to a first priority of study. R isn't talking about average every-day type of learning. He's talking about dedication. If I were assured of having free time later, I would say, let me concentrate on something else now, and I will concentrate on Torah then, without distractions. But it doesn't work that way.
Dedication means grabbing every spare moment, now and always.
And that if you use the time now your time later will be better used and you will reach a higher level.