A method of testing a proppant used in a wellbore comprising: (a) providing a proppant sample testing device that comprises: a pressurized fluid supply, an intensifier comprising an upstream cylinder having an inlet and an outlet, an upstream piston in the upstream cylinder, pressurized gas in the upstream cylinder and between the inlet and upstream piston, and hydraulic fluid between the upstream piston and outlet, a press assembly comprising a downstream cylinder, a downstream piston in the downstream cylinder and that has a low pressure side and cross sectional area that is greater than a cross sectional area of the upstream piston, a shaft connected to the low pressure side, and a ram coupled to the shaft, a test cell comprising an oedometer that selectively receives an end of the ram distal from the shaft, a line connecting the pressurized fluid supply to the inlet and in which pressurized gas flows from pressurized fluid supply into upstream cylinder, and a line connecting the outlet to the downstream cylinder, and in which hydraulic fluid flows from the outlet into downstream cylinder; (b) transporting the testing device to a wellsite having a wellbore in which proppant is being disposed; and (c) disposing a sample of the proppant in an oedometer, subjecting the sample of the proppant to an estimated wellbore environment in the oedometer, (d) introducing pressurized gas into the upstream cylinder to exert a force against upstream piston to urge the piston against the hydraulic fluid and forcing the hydraulic fluid from the upstream cylinder and into line and into downstream cylinder to move downstream piston, shaft, and ram to compact the proppant; (e) maintaining a magnitude of a force applied to the proppant at a constant value throughout a compaction phase to smoothly load the proppant to failure; (f) monitoring an acoustic velocity of the sample of the proppant over time with an acoustic sensor, and (g) determining a cure time of the proppant based on the step of monitoring. (a) providing a proppant sample testing device that comprises: a pressurized fluid supply, an intensifier comprising an upstream cylinder having an inlet and an outlet, an upstream piston in the upstream cylinder, pressurized gas in the upstream cylinder and between the inlet and upstream piston, and hydraulic fluid between the upstream piston and outlet, a press assembly comprising a downstream cylinder, a downstream piston in the downstream cylinder and that has a low pressure side and cross sectional area that is greater than a cross sectional area of the upstream piston, a shaft connected to the low pressure side, and a ram coupled to the shaft, a test cell comprising an oedometer that selectively receives an end of the ram distal from the shaft, a line connecting the pressurized fluid supply to the inlet and in which pressurized gas flows from pressurized fluid supply into upstream cylinder, and a line connecting the outlet to the downstream cylinder, and in which hydraulic fluid flows from the outlet into downstream cylinder; a pressurized fluid supply, an intensifier comprising an upstream cylinder having an inlet and an outlet, an upstream piston in the upstream cylinder, pressurized gas in the upstream cylinder and between the inlet and upstream piston, and hydraulic fluid between the upstream piston and outlet, a press assembly comprising a downstream cylinder, a downstream piston in the downstream cylinder and that has a low pressure side and cross sectional area that is greater than a cross sectional area of the upstream piston, a shaft connected to the low pressure side, and a ram coupled to the shaft, a test cell comprising an oedometer that selectively receives an end of the ram distal from the shaft, a line connecting the pressurized fluid supply to the inlet and in which pressurized gas flows from pressurized fluid supply into upstream cylinder, and a line connecting the outlet to the downstream cylinder, and in which hydraulic fluid flows from the outlet into downstream cylinder; (b) transporting the testing device to a wellsite having a wellbore in which proppant is being disposed; and (c) disposing a sample of the proppant in an oedometer, subjecting the sample of the proppant to an estimated wellbore environment in the oedometer, (d) introducing pressurized gas into the upstream cylinder to exert a force against upstream piston to urge the piston against the hydraulic fluid and forcing the hydraulic fluid from the upstream cylinder and into line and into downstream cylinder to move downstream piston, shaft, and ram to compact the proppant; (e) maintaining a magnitude of a force applied to the proppant at a constant value throughout a compaction phase to smoothly load the proppant to failure; (f) monitoring an acoustic velocity of the sample of the proppant over time with an acoustic sensor, and (g) determining a cure time of the proppant based on the step of monitoring.