Yeah, we do global updates, right. OSM edits are updated in their database instantly, but AFAIK there’s no service available which lets you download instant extracts from OSM. One day later they’re available at https://download.geofabrik.de.
Then you can download the OSM file and feed it into a local ORS instance, e.g. by building locally with Docker:
I fear it won’t get quicker than this. Well, wait. You can also get the local extract you’re interested in in XML format from Geofabrik, open it in JOSM, edit your data there, save it, convert the XML to pbf in osmium and build the graph in ORS. It might be a bit painful, since JOSM is not really designed to make import of that size, but it’s sure workable. That’s the only method to instantly check your changes. One ‘update’ cycle would take around 15 mins for the whole workflow, if you know what you’re doing.