How long does the e-bike battery last?

Several factors affect battery life:

Trail surface
Trail steepness
Power assistance level: the amount of power used
Rider weight

There are three power assistance levels:

Eco-Mode (Low)
Enduro Mode (Medium)
Turbo Mode (High)

Using the battery efficiently on Eco-Mode can easily make the battery last a full day rental, especially if uphill segments accumulate to less than 400 vertical meters.

In Enduro assistance mode, you can expect a comfortable 2 to 4 hours of usage.

With Turbo mode, the battery might last less than 90 minutes.

Remember, you can switch power modes while cycling and adjust the level according to the terrain for optimal battery usage.
Doing reasonable control will enable you to ride for up to 7 hours using all three modes. We can compare it to a car; if you ride at 7.000 rpm all the time, it will consume a lot of petrol compared to if you drive at around 1.500 rpm.
"If you want to last longer, go moderate!"