I don't believe so. All you are doing is changing the system time, which is what the game takes its money-making mechanic from. After you have returned to the game, your money will be added as though you haven't played for a year; you can then save the game and go back and set the time to what it should be. You cannot do this however if you are connected to Xbox Live, as the time is synched from the server.
I am just adding this to the answer only add about a month of time to the xbox because fable has a cap of money that you can get at a time