The Scotsman has begun life at Old Trafford in mediocre style with the club currently sitting 12th on the Premier League table after six games.
The critics are already starting to jump on Moyes' back but former club captain Neville feels the ex-Everton boss will be given at least a few seasons to get things right at United.
"If you think about the early years of Sir Alex Ferguson, he was allowed to develop into a presence. In the first three or four years he was at the club he was coming under intense pressure," he said on Monday Night Football.
"David Moyes, there's no doubt about it, is still learning to come to terms with his squad and getting to know his players and the culture of the club.
"People have said he's been negative in press conferences and they probably have got a point on that. Manchester United fans don't like sensible and realistic, they like to dream and they want to hear that the club can win the league and can win the European Cup.
"But he's finding out about the club and one thing's for certain; you've got Sir Bobby Charlton in the boardroom and Sir Alex Ferguson in the boardroom and David Gill in the boardroom. That manager isn't going anywhere by the way.
"I put it towards the players. I know a lot of those players and they'll be hurting like mad. A lot of players will go before David Moyes goes because, believe me, they will give him time."
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