Ex-Tropical Cyclone Alfred has wreaked havoc across South-East Queensland and Northern New South Wales, but the worst has past and clear sky are on the horizon.

That means the clean up will begin and so will the restocking of supermarket shelves, but how long will it take for shops to refill all their empty aisles.

Fleur Brown from the Australian Retailers Association told Peter Fegan on 4BC Breakfast, "The supermarkets in particular are absolutely working around the clock on solving the problem."

"There's just some factors outside of their control that they can't force staff to come in when they may have transport safety issues or they may have their own property damage or childcare constraints, so that's another factor in all of this," Fleur Brown said.