The 100 bolivar bills would temporarily remain legal tender, Maduro said yesterday, but the borders with Colombia and Brazil will remain closed to hit what he claims are "mafias" hoarding Venezuelan cash abroad in a US-backed plot to destabilise the country.
"You can calmly continue to use the 100 bill for your purchases and your activities," Maduro said at a meeting with officials broadcast on state television.
The bill is worth about 15 US cents at the highest official rate, and until recently accounted for 77 per cent of the cash in circulation in Venezuela.
The government is trying to introduce new bills in denominations up to 200 times higher than the old ones, but the plan derailed when Maduro banned the 100 bolivar note before the new bills arrived.
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Four airplanes with the new currency set to arrive from abroad were delayed by international sabotage, Maduro said. He did not say where the money was coming from, or what type of sabotage.
Venezuelans stood in long lines at banks all week to meet a Friday deadline to exchange their currency. When the deadline extension was announced people queued up again yesterday.
Rivero said that she traveled 450 kilometres from her village in the eastern state of Monagas to exchange her money.
In a country with one of the highest rates of violent crime in the world, shoppers must carry unwieldy wads of bills to pay for their purchases.
Retirees had complained for months that their pensions were paid in unmanageable 50- and 20-bolivar denominations.
Opposition politicians said yesterday that four people were killed in rioting in the capital of the southern state of Bolivar, though officials have not confirmed those figures.
Unrest however was such that the Ciudad Bolivar mayor ordered a curfew banning "motorcycles, pedestrians and private vehicles" until late tomorrow.
The pro-Maduro state governor, Francisco Rangel Gomez, said on Twitter that 135 people were arrested for looting, and that soldiers were deployed "to re-establish order."
In Guasdalito, in the central-western state of Apure, three state bank offices were torched, an incident Maduro late Friday blamed on unnamed opposition politicians.