question about spag on mounts

[VickiC]

Hi everyone,
I've mounted 3 orchids recently for the first time, but I don't know how long I should leave the spag that I placed under and over the roots on the mounts, or do I remove it at all ....I know that eventually it will fall off of the mount on it's own (at least I think it will....surely) but I'm clueless if I should wait for that to happen, or not. ?? I really would appreciate it if someone won't mind helping me with my question.
Vicki