The best way of getting this free is to save up Gollum's Tokens and use them on 'Premium Chance' where the prizes are better. This requires 6 tokens to play, you can cut the wait to 3 days instead of 6 days by getting the free extra token which is available daily. There is also a chance playing 'Premium Chance' that you could win some hobbit building crews or training runes which can be used to level your hero.