✅ Long Oven Mitts I Use (Amazon – paid link): br Disclosure: Some links above are affiliate links — which means I may earn a small commission if you click and buy, at no extra cost to you.br br Ninja Support: br Ninja Double Oven (DCT451) timer confusing you? This guide explains why the timer doesn’t start until preheat ends, how top and bottom ovens count independently, the 10-minute standby auto-shutoff, and the “END” cycle shutdown — plus tips for safe mid-cook checks.