MSP432P401R: Polling data for 3 seconds using a timer

Part Number:MSP432P401R

I am following the instructions on how to calibrate the 2 clocks of a sensor. I am stuck on the step where I need to poll data from the sensor's FIFO data register using I2C for exactly 3 seconds. I know the best way to go about doing this is by using one of the MSP432's timer, but I do not have enough experience to implement this. Any suggestions would be greatly appreciated!