Personally the sooner the better but the gas is a killer just loft train them, then when you go somewhere that you need to take them with you. Unless you are on a system which you have to train them early. Its going to be a long time until Yb season to train this early. Or just wait until 1month before the races to get going. Thats my suggestion Gas and 20miles dont mix . But i would do it ifi had the chance this early. Im not to sure about burn out yet i havent had a long career in racing pigeons.