How long is acceptable for a wing to hold air?

[admikar]

OK, temp drop from your breath to room temperature might be part of your problem.
Not saying that that is your problem, just that it might be part of it.
After that initial loss, does it keep losing pressure?

 

[Shabaday]

OK, temp drop from your breath to room temperature might be part of your problem.
Not saying that that is your problem, just that it might be part of it.
After that initial loss, does it keep losing pressure?

I will check it out over the next few days