A freeware app that measures exactly how long it takes for Windows to fully start. Key Features Measures how long it takes for the entire system to fully start up. Supports Windows Dark Mode. Supports comparing your results with other users. See the Leaderboard below. Freeware and lightweight. No bells and whistles. No nonsense. Startup Timer provides two measurements: How long it takes for Windows to show Desktop, and also, how long it takes for the system to fully start. We define a system being fully started when the CPU usage has dropped under 5%.