Thanks for the reply guys. I am considering a sea level aerodrome with high temp and low pressure. So I am looking for a simple answer like,
i) You will have a longer run because there is a lesser amount of air and to amount for the poor performance, you're having a higher power setting and poor performance by the engine while using reverse thrusters.
or
ii) You will have a shorter run because the performance of the engine and aircraft is already low.