It's a difficult balancing act, and with the season still in its infancy. I don't expect any sacking.
The fairly well established criteria seem to be a winless run that extends over 2 months or so, and/or a threat of relegation.
The primary consideration if Brands decides enough is enough, is that a replacement is all but tied up.
He should have his eyes peeled either way, but things might stabilise then.
The more quick fire managers we have, the more reputational damage we do to ourselves within the field of managers we hope to attract.
If he can ride out this storm but fail to make Europe, then that's the likely time to do something.