United have had teams that could run for a while almost without a manager. A bit like post-Jose Chelsea or Everton 2013, as Moyes claims it to be. United of recent years has not been that team and Moyes certainly didn't get a team that could still do the job while he learns things. But at the end of the day, big clubs regularly appoint new coaches when they are in need of a change or certainly are not at the top of their game. And they expect things to change and improve pretty quick.
I think Moyes got a six-year deal simply to annnounce to the world that even without Fergie, we're still looking for stability. I doubt anyone at OT, from the Glazers down, expected or thought that we'd be in this position in December, after so much rubbish football.
But yeah, Moyes will get a lot of time - unless the Glazers decide to step in. Fergie has been so supportive of giving managers time, and he's also mellowed a lot in recent years. If Anderson got SIX years under Fergie, Moyes could complete 26 years of his own.
To be fair, that could also be a problem, Fergie's tendency to be over-patient in recent years. I'm not as confident with him taking the tough but correct decision as much as I used to.