Directly from the FAQ on the website:
What about the range of Energica?
The range depends on its use, just like any type of vehicle. You’ll get about 150 km range with an average speed of 80 km/h, and 190/200 km with an average speed of 60 km/h (street circuit). On racetrack you’ll get about 50 km range with an average speed of 100 km/h, but the Energica Ego is a streetbike not a racebike!
It takes too long to recharge the batteries!
FALSE. Energica EGO has a battery charging system of 110-220 V with a cable interface on the electric column. It will also be available with a recharge inlet for the FAST CHARGE DC Combo 2. So in AC charging (alternating current, such as at home) Energica recharges from 0 to 100% in about 3.5 h, while in DC charging from 0 to 85% in less than 30 min.
Right away they say it's not a race bike so taking it to the track wouldn't make it shine. They do have race options on the web site, but not much info on it (1.1, 1.2, 1.4 models).
If somehow you could rig up a capable DC system at the track, you could run flat out all day long if they are running 3, 15 minute groups.