thank you
The length of an episode is going to vary greatly among individuals. Ways of coping are going to vary too, but might include concentrating on specific tasks like singing, cleaning, exercising, gardening, puzzles, anuthing to focus concentration elsewhere, using distractions like music, television, movies, sometimes (if safe to do so) you can talk back to voices - tell them to be quiet, ask them what they want, try to schedule an appropriate time to listen to them, you may have to experiment to find something that works for you. You should also definitely report these episodes to your therapist and/or doctor. They may prescribbe medicine that you could take daily, or prn.
I am sorry these episodes are bothering you. It might be helpful to try to discover if anything in particular might be triggering these episodes, and any changes in their frequency or duration.
I hope you will be feeling much better soon.