normally wheel bearings just make noise and the car doesnt 'roll' as well because of the bearing being toast. normally you can drive on them for a good amount of time, but the risk is there that eventually it will bust and cause some major damage. ive personally driven on a bad wheel bearing for over a year or so before i changed it out, but dont follow in my shoes because i break things a lot.
youll notice a groaning/humming when youre driving, sometimes around certain speeds. the real tell is by grabbing the tire and it will have a little give when moving it side to side or up and down. the car obviously has to be off the ground to tell this.