ok the A-4 last I flew it was from Deois to Banish Riot less then a week ago that was 1600 km.
on that trip I was at 14-19 Km 16 km was probably the best speed...
trolling along at 0.197 to 0.225 km/sec I think 0.22 is a high but fair cruise estimate...
But lets look at a 2500 km trip that covers (or close to )
Deois to rare
Deois to Kansas Fuel mine.
Deois to Caddassum once its rebuilt.
SO
2 500 kilometer = 1 349.892 008 639 mile [nautical, US]
16 kilometer = 52 493.438 320 21 foot [international, U.S.]
0.22 kilometer/second = 437.365 010 799 knot
Figuring climb time is close to made up with a good descent path ....
2500 km / 0.22 km/sec=11363.636363636363636363636363636 seconds
189.39393939393939393939393939394 minutes
3 hours 9 minutes 24 seconds each way straight line.