Edit: The way that he is saying it is expressing it such that if you were to spend 98,245hours processing, you would come out with 50BTC for each 1MH/s you could process.
Perhaps. "98245 hours per MH/s" to me says that if you had 2MH/sec you would need 2*98245 hours to generate 50BTC. (Of course, you would need 98245/2.)A better way to express it using similar grammatical structure would have been "50 BTC per MH/s every 98,245 hours". The "per" was in the wrong place.
