Production & ManagementEggs - BreedersEggs - Layers If you are heat treating stored eggs to improve hatchability (SPIDES), how long should the eggs be kept warm? By Jim - February 26, 2021 540 FacebookTwitterPinterestWhatsAppLinkedinReddItEmailPrintTumblrTelegramMixVKDiggLINEViber Please enjoy a series of Hatchery Tips provided By Aviagen: Tip 28 Aviagen’s early SPIDES trials were aimed at defining the safe limits for heat treating eggs during storage – how long, how often and how hot the treatments should be.