Who said 'if you are too busy meditate for two hours'? There is a zen quote that goes something like


  Meditate for an hour every day unless you are too busy. In that case
  meditate for two hours.


I'm not sure about the exact quote - it might be 0.5 hours/1 hour or some other timescale. Does anyone know what the exact quote is and who said it?
Isn't this notion from meditation traditions in general?
James Altucher, in his Ultimate Cheat Sheet For Reinventing Yourself:

What if I don’t have time to sit in silence [for one hour a day]?
Then sit in silence for two hours a day.


which he adapted (with an entrepreneurial slant) from a story about Mahatma Gandhi.