Disclosing a Diagnosis of Cancer: Where and How Does It Occur? -- Figg et al., 10.1200/JCO.2009.24.6389 -- Journal of Clinical Oncology

Abstract:

"Forty-four percent of patients reported discussions of 10 minutes or fewer..."

Conclusion
Physicians should disclose a cancer diagnosis in a personal setting, discussing the diagnosis and treatment options for a substantial period of time whenever possible.