Yoga Sutras 1.21 and 1.22

1.21:Tivra samveganam asanah, To the keen and intent practitioner this samadhi comes very quickly.

This sutra addresses the samvega (intensity) of the practitioner. I have a soft spot for teaching with stories. From Carrera's commentary on this sutra,

[A sincere student once approached his guru with a question: "Master I have been meditating and practicing all sorts of disciplines for many years. Still, I have not seen God. What is necessary for me to do? What am I missing?" Instead of speaking the master escorted his young student to the banks of a nearby river. He asked him to bend over. Suddenly he grasped the young man by the back of the neck and thrust his head underwater. Soon the man was squirming, struggling to break free. A few long moments passed before he was released. Grasping for air he asked, "Master, why did you do this to me?" "When your head was underwater, what were you thinking?" "I was only thinking of breathing, nothing else." "You didn't think of your wife, job or your finances?" "No, only getting air to breath." "When you think of God with the same one-pointed fervor, know that the experience of Him is very close at hand."]

The point being more intensity equals faster progress.

1.22 Mridu madhya adhimatratvat tattopi viseshah, The time necessary for success also depends on whether the practice is mild, moderate or intense.

This sutra talks about the method of the practitioner, referring to quantity of practice. Patanjali doesn't mention time spent but the lifestyle of a householder makes it more difficult than for a monk to have an intense practice. Nevertheless if you take a look at your life and those around you, most of us have no trouble making time for what is really important to us. Revisiting sutra 1.14, Patanjali stated that regularity and enthusiasm over a long period of time are what constitutes a firmly grounded practice. So I recommend doing smaller amounts regularly. Make sure this is doable and if at that point you feel like stepping up the practice, do so in small increments.