They had crossed the few decades from Xown in the Mureite system to Eshri in Izenion within the 5*Gelish-Oplule, a regimental cruiser about as fast as anything the fleet possessed.
- Hydrogen Sonata, Chapter Seven: (S -20)
The (S -20) in the chapter refers to days till sublimation. At most the time frame between leaving Xown and arriving at Eshri was 3 days as the character (Cossont) was still in Xown when (S -23). Thus the low end average speed for one decade in 3 days is 1200c. Peak velocity would be twice that at 2400. Acceleration would be .018 c/s. This assumes a 50:50 acceleration:decelleration flight profile.