You are able to wear your Helloface for as long as comfortable for you. The materials are non toxic and safe for extended periods of time against the skin. Helloface face coverings are not yet tested for exercising or moderate to heavy activities.
Condensation may build up depending on the ambient temperature and breathing rates. You can wipe this away in the lower channel without affecting the anti-fog.
The Helloface shouldn't be worn while sleeping or exercising. Face coverings should not be used by, or placed on, people with skin sensitivities, anyone who has trouble breathing or who is unconscious.