Well, 100% isn't reachable. But a high confidence is reachable. The thing though is, your PM isn't asking you for 100% confidence. He's asking you to make every

Well, 100% isn't reachable. But a high confidence is reachable. The thing though is, your PM isn't asking you for 100% confidence. He's asking you to make every single 2 hour tasks into a weeklong research and engineering project. So sure, tell him everytime he asks this, it'll take you a week to make sure.