Ronnie,
If this doctor is know to be one of the best, then it seems like you can trust his judgement on time frame, assuming he knows how long ago you were diagnosed.

I know that my husband was told that his tonsil cancer had probably been developing for 1 1/2 to 2 years before it was diagnosed, so it doesn't seem like two weeks would make that much difference, but I guess it depends on how aggressive your particular form is.

Best,
Anita