Your question is actually asking how much work HR should do every day to be normal. From the performance point of view, it is normal that the amount of completion is directly proportional to the result of completion. It's not about how much work you have to do in a day.

If you feel that you can't finish these tasks in one day, try a more efficient tool and a different way of working to see if there is any improvement.

As for those online companies that recruit hundreds of people a day, it's just superficial. You don't know what the division of labor is behind, so you can't compare it.