The high flying Cannon Park side are also still in with a chance of reaching the UniBond Premier Division play-offs if rivals Kendal are not able to secure three points from their clash with Whitby Town on Wednesday evening.
Speaking exclusively to the Retford Times, an emotional Duffield said the players will not be surprised by his decision as he spoke to them two weeks ago about his wish to leave.
Duffield claims neither himself or the players have received their wages from last month and that a long list of broken promises by the club have led to him finally making this decision.
"But it's the players I feel sorry for. Some of them have had to be loaned money by myself and Mick Godber just so that they can make it to away matches.
"It has been a long time since I have had a peaceful night's sleep because of all this and my family have also suffered because of it.
"I don't know the reasons for all the problems at Retford, all I know is we have not been played for quite a while.
"I know the club is trying to raise money and I genuinely feel for Retford, but it is time to move on."
Chairman Bill Wyles said: "We have a problem in that our main sponsor has only paid about a quarter of the money he agreed to pay in the deal and that has left a massive hole.
"I can understand Peter's frustrations and we have nothing but praise for his efforts during his time with Retford.
"On a personal level, I have always got on well with Peter and I shall be sorry to see him go."
This Is Retford