B44 - 7.5 - 6000mah lipo - 45min
B44 - 6.6 - 6000mah lipo - 35-40 min
B44 - 7.5 4600 energy cells 20-25 min
B3 - 19t - 6000mah lipo - 50-55 min
B3 - 27t - 6000mah lipo - 1 hour
B3 - 19t - 4900mah lipo - 40-45 min
A lot of depends on how your driving, what type of surface, indoors or out, ect.... Others may have gotten better or worse.
The above is close to what I have experianced, with where I drive and with my driving style. The times are estimated! I have never actually timed them with a stop watch.
Original RC 10T, T4, RC8Te, Tekin RX8. Losi Ten SCTE, Slash 4x4.