We did 3 days last year. Spent one in Sorrento. one on Capri and the third at Pompeii and Herculaneum.
Heading back to Capri tomorrow for 3 days wityh 3 more in Sorrento after that.
Side note: Looking at getting from Naples to Capri there was an option to go by helicopter. I emailed and asked how much for 2 adults from Naples Airport to Capri, thinking might be nice surprise for my OH, AS she loves flying as I do. They replied 1650 Euros!! I know that is for 6 people, but there is only two of us. I did wonder if we got to keep the copter after...lol