I wonder if 12 hours wouldn’t do the trick?
From a box sold in San Antonio, Texas.
2 whole eggs
1 cup sugar
Juice of 1 lemon
2 tbsp. flour
Cook in double boiler until thick. Then cool.
Pour over 1/2 lb. marshmallows, cut.
Add cut grapes, pineapple small, and 2 bananas.
Let set in refrigerator 24 hours.