Take your time and you'll get there, eventually
Let's see, 1500nm at 100 knots groundspeed equals 15 hours.
Legs equal 2 hours with 30 minutes extra on each leg for approach and climbout.
That's 7 * 1/2 = 3.5 hours extra on top of 15 hours, for a total triptime of 18.5 hours, give or take 15 minutes or so.
Not that bad.
Of course I've not taken into account time on the ground, weather diversions, etc. etc.