Guaido's supporters worry that anger over the country's escalating problems will fade and therefore extend the rule of Maduro, whose re-election last year was denounced as illegitimate by Guaido as well as the United States and about 50 other nations.
"It's not normal," read a cardboard poster at an opposition rally in Caracas this month. It listed miserable conditions now synonymous with Venezuela: A lack of water and light, commuter trains that resemble saunas (when they work), hospitals without enough medication, and self-exile as a way to survive.
Maduro, meanwhile, says the water supply is "normalising" and has announced an electricity rationing plan as the grid stabilises, for now, in Caracas and other politically key areas.
But he also stokes an idea of crisis with references to a "permanent battle" against the US and other perceived enemies allegedly bent on unravelling Venezuela's "Bolivarian Revolution" and its socialist system.
Maduro's Government has described migration from Venezuela as "normal" and denied there is a humanitarian crisis, despite considerable evidence that there is. The Government has agreed to allow the International Federation of Red Cross and Red Crescent Societies to begin delivering medical aid this month.
As Maduro and Guaido spar over what normal means and who is to blame for Venezuela's shocking decline, a lot of Venezuelans are too preoccupied to gauge their own diminishing expectations.
Some residents of the poor Caracas neighbourhood of La Vega say the flow of tap water to their homes hasn't been reliable for more than a year, long before Venezuela's recent shortages.
This week, several dozen blocked a road and banged pots in anger over the current system of receiving water from cisterns.
"Piped water — we want to get water the way we did before," said protester Jhony Peraza. "Because what do we do with water for one day, two days? And then? Afterward, we don't have more water and then we have the same problem again."
The Venezuelan catastrophe has unspooled for years, fuelled by corruption, incompetence and oil dependency. The reality is wrenching for a nation whose idea of normal in now-distant good times encompassed flowing oil revenues, booming construction and generous government handouts.
A column in El Impulso, a Venezuelan media outlet, reflected on a country seemingly going off the rails.
"Everything is out of place. Everything and nothing is the same thing in the country. Salaries and basic needs aren't aligned. The normal country that we once knew is lost, mutilated, abducted," it said.
"We've become," the commentary concluded, "an abnormal country."
- AP