The phrase "day upon day" is correct and can be used in written English.
It is typically used to convey the idea that something is occurring repetitively or over a long period of time. Example sentence: Tom worked day upon day to save up enough money to buy a new car.
So day upon day, she prepared him those milkshakes and carried them to him in trembling hands.
Sixty thousand men a day were dying at the Somme, and the accumulation of that, day upon day, was horrific.
What would it cost the parish if 12 people started doing the math, adding up day upon day, year upon year for which Clyde was owed compensation?
Day upon day of mountain stages, several with nearly 4,000 metres of vertical ascent, this one with four major climbs, two of them first class category, can do strange things to a person.
But most of the damage came from day upon day of fierce, incessant rain.
The film's title proved prophetic last November when its shooting on location was blessed with day upon day without rain.
After Saturday upon Saturday of beachcombing on the shores near our home on Oahu, we have finally found the prize.
And it's so powerful because it has built, day after day, year upon year, on an emotionally appealing narrative of the plucky freedom-loving island that became a mighty empire.
The Barbican's Bauhaus: Art As Life brought the legendary modernist art school's pioneering public and giddy private world brilliantly to life, and there were plenty of surprise hits too, like the late German artist, Hanne Darboven, whose show at Camden Arts Centre featured diaries and calendars filled with meticulous scribbles, day after day, year upon year.
The equally depressed hero of "Retreat" hides out in a cabin in the mountains of Maine, where the air is "heavy with the watery sweetness of lupine, moss and fern," a place that impresses its glory upon him day after day.
And day after day, death upon death, they steal our dreams by killing the people we love.
