I'm planning ten days in Italy in mid-March, arriving in Rome on the evening of day 0, and tentatively flying out of Naples on day 11. (so, 10 full days on the ground)
I'm a slower traveler and getting a feel for a sense of place is an objective of all my travels. Wondering neighborhoods and nursing a drink on a terrace are as valuable as museums and palaces, and I never stress about seeing or doing EVERYTHING.
My current plan/idea is to have 5 days in Rome and 4.5 days (after transit, train, hotel...) in Naples, to include a day in Pompai and maybe a day in Capri or Sorrento.
Does that seem like a reasonable plan to split my time over the 10 days?