There was a small study published in 2024 that used a 10-day t-VNS intervention at home (30 min/session, twice a day) while a study in 2023 used 35 min a day in total, every day for 6 weeks. . Studies also direct to use the right ear only as the right side of the brain is believed to govern “neurocardiovascular-sympathetic interactions”. The best attachment point may also be the cymba conchae rather than the tragus (please google for ear anatomy).