How long do I have to run Boston once qualified? -

I qualified for the Boston Marathon in a race in October of this year (2009); will I still be able to run Boston in April 2011?

You should be okay, as accoring to their site, in order to run in 2010, you have to have had a qualifying time on or after September of 2008. Thus, your October 2009 qualifying time should leave you all set for 2011.