How to run stepper motor for particular amount of seconds


In my project i am using stepper motor with nrf52840 and here i want to run my stepper motor for particular amount of time like i want to expel a particular amount of fluid with respective amount of time for example i want to expel 10ml from the tube with 2ml per second since the total amount of time consumed for expelling 10ml is 5 second. so how to implement this anybody have idea on this please feel free to drop your comments.

5556.Spec_STP-60D5016GA (1).pdf

the stepper motor which i am using is STP-60D5016 and for more clarification please have look on  above datasheet. 

thank you.