Domestic rules cover. Its the norm that races are categorised, 1 day, 2 day, 3 day, 4 day depending on distance. Guess the bottom line is when the master timer is opened..... race over!
I remember reading an article (think by Patrick Bros. not 100% sure) where they run copper wire around their shed and earthed it, think they called it a Faraday cage, this apparently helps to stop losing young'uns of the loft.
I tried it Vic and it made no difference at all. No matter how much they're fed if they've got their hen on their mind they're not going to rake the skies. I believe cutting back how much they see their hen is the answer to how long they fly. Fill their pots up on Sunday & Monday and they'll still not want to venture far from the loft whilst their hen is still fresh in their memory. I'm not saying I advocate this, on the contrary I keep them short at the beginning of the week and use this to my advantage.