Don’t over inflate your float.
The amount of air in your float will shrink and expand depending on a whole heap of factors, the weather being the biggest one.
Sun and heat will increase the amount of air in your float. If it’s completely inflated and you spend a glorious day on the water in the summer sun, your float friend will probably overinflate and get a hole somewhere.
When you’re inflating make sure you don’t get rid of all the wrinkles (they’ll eventually go away). The float should be firm, but not hard.