theres no need for 45 mile, 12 mile would be just as efficent, mark evans never lets his widowers out 12 miles every day, by training the birds would work much harder then they would around home, if your sprint minded single up from these points are essential as teaches them there route of braking, as im a big believe in sprint racing, the birds that top the federation are the ones braking from 12-15 miles from home, and not the one braking 5 miles from home.