You can reserve your MILES for up to 12 hours - the first 15 minutes are free. Every additional minute costs 0,09€.
It's this simple:
Open the app, select your MILES and click "reserve" directly under the "rent now" button.
Once you've reserved a vehicle, you can also extend your reservation at any time. Please note that this will result in additional costs.
If you don't make it to your vehicle within the reservation time, you can extend your reservation at any point: Simply tap on the green "+" symbol next to the current reservation time in the vehicle view, and extend your reservation.
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☝️Note: If you arrive at the vehicle before your extended reservation expires, you will not be charged for the additional minutes!