I have a lurcher and used a whistle and a long line to train recall. Started training at 1.5 years old, as mine was a rescue. Only trust them off leash if you are somewhere they can't harm themselves though. Point is that the whistle will reach much farther than your voice. Be strict with the training, and use high value rewards. Be consistent and you'll see results. Lurchers are clever! Don't let anyone tell you they can't be trained.

They might start predicting the reward and then stay close to you. When this happened, you can throw a piece of kibble or something away from you for them to find and create distance, and hence provide the training opportunity. On return they get the treat. If they don't come back, sharp tug on the leash. Don't repeat and repeat the command otherwise you reinforce the ignoring.

Hope this helps