Life does not unfold in a single financial phase - it moves through seasons, each with its own demands, opportunities, and appropriate uses of capital. Yet most personal finance frameworks treat money as a single undifferentiated pool, leaving individuals ill-equipped to align their spending with the temporal rhythms of a well-designed life. Time bucketing resolves this misalignment by assigning financial resources to clearly defined life horizons - transforming money from a source of anxiety into a precision instrument of intentional living. At its structural core, the time bucketing strategy divides assets into distinct temporal categories - immediate needs, medium-term lifestyle goals, and long-term growth - each governed by its own investment logic, risk tolerance, and purpose. Popularized in financial planning by Nobel laureate Richard Thaler's concept of mental accounting, the approach leverages the psychological clarity that comes from knowing exactly what each portion of one's wealth is designed to accomplish and when. The result is not merely better financial organization - it is a measurable reduction in behavioral risk, including the costly impulse to liquidate long-term assets during short-term market volatility. This book extends the bucketing framework beyond retirement planning into the broader philosophy of intentional life design - treating each time bucket not only as a financial instrument but as a deliberate investment in a specific chapter of one's life. Drawing on the frameworks of time segmentation, the Die With Zero philosophy, and modern behavioral finance, it explores how spending decisions made with temporal clarity generate greater fulfillment, fewer regrets, and more durable financial resilience across every stage of life.