I would say it all depends on what price bitcoin is and if you plan on selling for bitcoin or for usd. I am personally going to sell for usd, but I will use this ratio to feel out my exit. I would say if litecoin reaches 0.05, you want to sell. If bitcoin makes a new high past 1200 litecoin should be past 50, so you sell for usd. If bitcoin is still under 1200 like it was the last spike to 0.03, you sell for bitcoin.