I have never heard of this problem either in UK. In the past I have developed Pan F and other Ilford films several years after exposure, even ones kept in a camera in the tropics, without any apparent effect. Where is the original evidence on this perceived need to keep the time between exposure and development as short as possible? I would like to know because I might learn something new.
it's called 'latent image stability' and it's not endless. film manufacturers have recommended to keep the time between exposure as short as possible,but stories of decade old mystry developments keep popping up too. one day we mayyet see a picture of a real neanderthal shot with an AGFA-click fromm 10,00 BC, WHO KNOWSI develop film as soon as i can ,but don't race home for it either.