Fraud is irrelevant in the case of a bank bouncing a cheque, the same timeframe applies regardless of the reason. I'm assuming here that the cheque is a € item lodged in an ROI branch of a main clearing bank (eg AIB. BOI, UB etc) and that the cheque was drawn on another ROI bank. Time frame would be as follows
Day 1: Item lodged, processed overnight by the collecting bank
Day 2: cheque sent to the drawing bank who process and debit the item overnight to the drawers account
Day 4: Under the industry rules, drawing bank has until the COB on day 4 to decide to bounce the cheque (most would be done on day 3). Item is sent out that night or the next morning to the collecting bank (most have centralised unpaid units these days so it usually is not sent to the relevant branch), together with a corresponding electronic entry
Day 6: electronic entry and cheque should be received by the collecting bank, they debit the payee overnight so your account shows as being debited on Day 7.
There are additional industry rules which allow, in exceptional circumstances, for this timeframe to be extended, usually this can happen where a cheque has got lost in the course of processing (which given that over a million cheques are processed in Ireland weekly, does happen), but they only apply in exceptional circumstances
Note if the cheque was sent on a collection basis then this timeframe does not apply. Likewise if the cheque is drawn on a building society/credit union or a small bank like KBC or was lodged at a building society or credit union, then the timeframe is usually extended by a day