Intensive Sadhana and it's aim

A few months back, I came across an interesting lecture by a Guru on youtube. He is from my own Yoga lineage but lives somewhere in the US now. He was saying - " if you want self realisation in 3 years, practise meditation for 18 hours a day. If you meditate for 12 hours a day, you would get liberation within 6 to 12 years. If you practise meditation for 6 hours daily, you may get self realisation in 24 years or so. And if you practise mediation for 2 to 3 years every day - you may get realised in this life or perhaps the next one, if you are consistent. " I wonder how many people would have the stamina for a 12 hours routine ? But look at the reward at the end. Why dont such lectures inspire people to take up yoga and meditation seriously ? Does it seem uninteresting because of non belief or because we have a lot on our agenda ? Perhaps its a little bit of both. I have been practising a yoga technique given newly by my Guru for the past three weeks. At the end of the practise session, the results are so much that I am amazed. The murmur of the physical heart dies down considerably and that of the thoughts in the mind. The mind flies off in some strange unknown direction. The heart is cleansed off muck in a strange incomprehensible way. The resulting feeling of well being and confidence is palpable. And I am only three weeks into this new technique that I am practising. I wish the world knew what lies underneath yoga practise !!! No, its not just boring asanaas and pranayama breathing....there is lot more to discover ....if you just practise long enough and intensively......