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The range of an electric bike depends essentially on four variables - (remaining) battery capacity, rider weight, terrain complexity and level of battery assist. However, every e-bike allows you to continue riding even after the battery is exhausted, as on a normal bike.The lowest range belongs to the folding e-bike, where the low weight is the main goal. For example, the most power and longest range are shown by mountain e-bikes and some trekking e-bikes with more battery capacity.
If you need a longer range with battery assist than the approximately 100 km, you can, of course, allow the bike to charge (it takes about 1 hour to charge the battery to 50% of the capacity), or you can buy a spare battery and double the trip.