Try it and the live maps use it. Checked with BeMap from your browser, it is kept for this browser tab until you sign out, close the tab or leave the documentation, and never written to disk.
BeMap bounds the size of a request: how many waypoints a route may have, how large an isochrone may be, how many items a batch may hold. A request beyond a limit is refused with 400. The limits below are the ones production enforces, read from the service itself.