I think it'll save him until May.
Unsure what will happen after Labour get utterly planted in Wales, Scotland and our locals though.
That being said it is harder to unseat a Lab leader than it is a Con leader, so people shouldn't expect it will go quite the way it did with Johnson and Truss. On balance I don't think he will be here by the next GE but he could last a lot longer than people expect, unless he chooses to resign. They would need to get behind an alternative PM/leader and then run them against Starmer in a full leadership election.
Will be very curious to see how things change with no McSweeney, because he was utterly useless and living off of a majority by default.