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This chart may give you a general idea of the average times required to get a drug through the clinical trials to approval process.http://www.fdareview.org/approval_process.shtmlThe particular type of drug can influence the time frames; an "orphan drug" - a drug that is being tested for a rare disease for which there is no effective treatment may get through the process a bit faster. Vaccines often take longer due to the need to test for both the short term and long-term effectiveness of immunity and antibody levels.
Here is another (more recent) reference that looks at the drug development process:
Do you know how long it took the HPV vaccine or the Varicella vaccine to go through trials and get approved or where i could find this information?