This New York Times article seems to have created quite an uproar among yogis worldwide.
I think a little story about a Qi Gong master and his new student explains it best.
The student approached the master, asking him, "How long will it take me to master Qi Gong?"
"10 years," said the master.
"Ohh", said the student. "That's a rather long time! I will practice as much as I can, as often as I can, as hard as I can - how long will it take me then?"
The master smiled that somewhat sinister zen smile those masters always have, took his time to stroke his long white beard, and then replied: "Then, my friend, it will take you 20 years."