It's not a case of how long it runs for. QPR will probably be subject to a 35-40m fine that will be payable sometime next year. If they then refuse to pay it, the FL could ban them from returning to the Championship, League 1 or League 2 indefinitely if they wanted (or until they pay the fine +...
The FFP rules weren't imposed on Championship clubs; they were voted for by an overwhelming majority of chairman - 21/24 I believe. They obviously seemed to think that there was a point to the restrictions.
No they couldn't. Accounts for last season (up to end of June) will be being submitted on December 1st. Any fine, embargo or points deduction will always have to be applied to following season