The CommandTimeout property of the MSSQL Storage is respected when provided in the ReportServerAdmin.config of the Report Server, for example with the following code:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="reportServer" type="Telerik.ReportServer.Web.Configuration.ReportServerConfigurationSection, Telerik.ReportServer.Web" requirePermission="false" allowLocation="true" />
</configSections>
<reportServer>
<storage provider="MsSqlServer">
<parameters>
<parameter name="ConnectionString" value="Data Source=(local)\MSSQLSERVER01;Initial Catalog=RESTStorage;Integrated Security=SSPI" />
<parameter name="commandTimeout" value="360" />
</parameters>
</storage>
</reportServer>
</configuration>
The user should be able to provide this value from the Configuration page for the Storage settings, as this is done for the connection string.