Some providers also rent out their vans by the hour. This way you can save a lot on the rental price. You can also rent vans by the hour via billger-mietwagen.de.
However, some providers do not see any difference whether the van is rented for 2, 10 or 23 hours – the full price for a 24-hour rental is always charged. You can return the car to the rental company earlier, but it will not be cheaper.