Make use the SqlMapper.Settings.CommandTimeout property as the default value...

Make use the SqlMapper.Settings.CommandTimeout property as the default value when the CommandDefinition commandTimeout property is not set.

Dapper NET40/SqlMapper.cs

@@ -183,7 +183,13 @@ internal IDbCommand SetupCommand(IDbConnection cnn, Action<IDbCommand, object> p
                 cmd.Transaction = transaction;
             cmd.CommandText = commandText;
             if (commandTimeout.HasValue)
+            {
                 cmd.CommandTimeout = commandTimeout.Value;
+            }
+            else if (SqlMapper.Settings.CommandTimeout.HasValue)
+            {
+                cmd.CommandTimeout = SqlMapper.Settings.CommandTimeout.Value;
+            }
             if (commandType.HasValue)
                 cmd.CommandType = commandType.Value;
             if (paramReader != null)