I got curious about how quickly we learned about Robbie's cancer when it was first announced, and so did a little digging.
On Thursday, September 11, 2014 we learned around 2:00 that Ford had been transferred from Humber Memorial to Mt. Sinai.
By 7:00 that evening, Dr. Zane Cohen gave his first press conference. By that point they had performed a CT scan and conducted a biopsy (presumably using the immediate results of the scan). Dr. Cohen informed us that Ford would be having an MRI the next day, and that the results of the biopsy would take a week.
We didn't hear again from Dr. Cohen until Wednesday, September 17 when we learned that the first biopsy had proved inconclusive and so Ford had undergone a second that Monday; the MRI had revealed a second tumour; and that the second biopsy had proved the tumours were cancerous. He also said that Ford and his family had learned the news in the last 72 hours, which technically means they could've known as early as Monday, after the biopsy.
Conclusions?