I have a few who's last into the thousands or even swat away infinite amounts. My first Eva who wields Excalibur could almost cut them down infinitely assuming they run in a straight line. Otherwise she'd be overwhelmed by the body count of everyone at every direction. So couple hundred.

Hound Dog who controls and generates electricity could fry a couple hundred as well but he'd burn up under that much electrical heat. Safely about 30 or so but otherwise he should run.

Barron a vamp who has near superman strength and blood manipulation would swat away infinite hoards and make himself a nice army of ghouls. As long as he brings his sunblock.