Related questions that might interest you as well:
Do air balloons last overnight?
Generally speaking, yes. Air-filled latex or foil balloons will not deflate overnight, especially when the arch, column or garland is indoors.
Even an outdoor arch or column will last overnight. However, dew and condensation during the night can make the balloon surface wet and slightly sticky.
This can cause balloons to fuse together when the sun comes out. Add some wind into the scenario, and a whole row of balloons might pop at the same time!
How do you make air balloons last longer?
The biggest "enemies" of balloons are humidity, heat, direct sunlight, sharp objects and wind.
Eliminating these factors as much as possible makes your blown up balloons last longer.
Air-filled balloon decorations that last the longest (several days to a month or longer) are typically indoors, away from entrances or windows, in an air-conditioned environment with constant humidity and temperature levels.
If you're decorating outdoors, longevity is greatly reduced. Avoid exposure to direct sunlight and wind, if at all possible. The choice of color and balloon brand can also help extend the life of outdoor balloon decor.