A torque wrench can be dangerous. It is tempting to check the torque on the crank bolts after riding it just to see if the torque has changed. If you check you will see that the torque has decreased and the bolt needs tightening. If you continue to retorque the bolt you will end up damaging the crank arm and maybe even splitting the hole in the crank arm.
So torque the crank arm bolt to the correct torque and forget it until you need to pull the crank again.