A puzzle about DQN

Why do you use update_times = int(buffer.cur_size * self.repeat_times / self.batch_size) when updating the network?
update_times = int(buffer.cur_size * self.repeat_times / self.batch_size)
for update_t in range(update_times):
obj_critic, obj_actor = self.update_objectives(buffer, self.batch_size, update_t)
objs_critic.append(obj_critic)
objs_actor.append(obj_actor) if isinstance(obj_actor, float) else None