doppel works best when you need it most and there is no designated length of time that you must wear doppel for.
Can I wear doppel all day?
Yes. Many of our doppelgangers who use doppel to help manage their anxiety often report wearing doppel all day as an anchor to keep them steady throughout the day. You will notice doppel's calming or stimulating effect at the moment, and once that feeling state you can choose to keep it on as a safety-net or turn it off.
Other doppelgangers only wear doppel in the moments of their day that they know will be stressful, for example before a meeting, presentation or when they anticipate a panic attack or an increase in anxiety.
If I wear doppel for too long, will I become immune to the effect?
No, doppel's effect works similarly to music. Just as you could listen to an upbeat or calming song repeatedly and still be influenced by the pace of the beat. So, you can wear doppel for as long as you like, or as long as you feel you need.