If you write that in your article, it would be wildly inaccurate.
1. Cruising altitude for a 300 mile flight on this aircraft would be around 21,000 feet.
2. Addis Ababa is at 7,760 above Mean Sea Level so the aircraft would merely attain cruise altitude more quickly than normal.
Climb would take about 15 minutes or so. Cruise about 55 minutes. Descent about 15 minutes give or take.
You would know this if you actually took the flight. Are you trying to mislead people into thinking you went on this flight? This doesn't strike me as journalism. Perhaps, if you choose to write a travel article that indicates you were on a particular flight, you might want to actually go there.