If you commenced in May 2007 and have done accounts to 31/12/07, then provided (a) everything is present that is required and (b) your accountant can get to them fairly quickly then any overpayment due from calculated s/employed losses being set against PAYE income/tax, would, if filed through Revenue Online Service only take a couple of weeks. However as said in (b) the main timescale here is how long it will take your accountant to get to them and through them.