IQuery.SetTimeout work incorrect for ExecuteUpdate

Try execute next code:

ISQLQuery query = session.CreateSQLQuery(script);
query.SetTimeout(120);
query.ExecuteUpdate();

and in NHibernate.AdoNet.AbstractBatcher.ExecuteNonQuery(IDbCommand cmd) set breakpoint over line "return cmd.ExecuteNonQuery();" and in debug window I sess cmd.CommandTimeout=30