We must expect to fail... but fail in a learning posture, determined no to repeat the mistakes, and to maximize the benefits from what is learned in the process.
Anything that is wasted effort represents wasted time. The best management of our time thus becomes linked inseparably with the best utilization of our efforts.
What do you want to get done? In what order of importance? Over what period of time? What is the time available? What is the best strategy for application of time to projects for the most effective results?