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Radio frequency (RF) energy harvesting is key in attaining perpetual lifetime for time-critical wireless powered communication networks due to full control on energy transfer, far field region, small and low-cost circuitry. In this study, we formulate a novel minimum length scheduling problem to determine the optimal beam-forming weights, power control and time allocation to minimize the schedule length. We consider the traffic demand, maximum transmit power, scheduling and energy causality constraints for a full-duplex wireless powered communication network. The formulated optimization problem is a mixed integer non-linear optimization problem therefore, difficult to solve for global optimum. As a future work, we present an efficient solution strategy based on the decomposition of the problem into power control problem and scheduling problem.