Web Site Times Out - Setting A Timeout Value

My web site times out when I run a SQL Stored procedure that takes 47 seconds.

I thought that I had prevented this by setting time limits to 600 seconds for both the SQL connection and httpRuntime  My web.config contains: -
<add name="ConnectionString" connectionString="Data Source=xxxx;Initial Catalog=gdb;Persist Security Info=True;User ID=xxxxx;Password=xxxxx;connection timeout=600" providerName="System.Data.SqlClient"/>and

<httpRuntime maxRequestLength="8192" executionTimeout="600"/>

Is there anywhere else that I should specify this larger timeout limit?

Thanks, Robert.