Dried beans. Soaked overnight. Drained. How long can I keep them in the refrigerator before use?
In this case it's not so much about safe. As indicated under 5 days is probably safe for uncooked veg protein. That's what we use in the restaurant world as general safety rules of thumb. 2 days for meat, three days for starches, 5 days for beans.
However, you may decide that the beans have significantly softened and may no longer be suitable for your application. It depends on what you are doing. Beans in a chili (I know chili doesn't have beans in it) you want to have some firmness, beans in a burrito medium firmness and beans for a bean dip or refried, well you want pretty mushy.
So safety wise you are probably just fine, but make sure your application warrants how soft the beans may become.
I would try to use them up within a couple day, just to be on the safe side. Make sure that you're storing them in an air tight container, that usually helps keep it fresher.