"Issue bomb" referred to your escalating difficulty and time necessary to mine Ethereum blocks to discourage a fork after the blockchain transitioned to evidence-of-stake. There isn't any preset deadline for just a Bitcoin Miner code, even sometimes, several codes get expired in 24 hours of their release. This is because https://premiumexpertminers.com/Fits-Nissan-Titan-Parking-Brake-Cable-Rear-Left-Raybestos-GV-472934/en/item-yc3rm/