They can't be making any money surely on these short cruises

Iona already back, just a "circuit and bump" to Dorset. 3 day round trip.

Further the cruise ships generally arrive as Southampton around 6am and sail after 5pm. So in winter months arrive and sail under the cover of darkness. Not Covid related, same re normal cruising timetables.

To the best of my knowledge just arrived. Back in Southampton on 30th. Routine.. couple of days in port then back to the bay. Two more days or so back to Southampton. Only change in this routines was 9th July to Kristiansand, 5 days , and then back to Southampton by 19th. Majority of the Dorset area anchored cruise ships circulate between the bay and Southampton every four days or so.
See port website ..where destination says World it means the Dorset/Cornish bays. https://www.southamptonvts.co.uk//Live_Information/Shipping_Movements_and_Cruise_Ship_Schedule/Planned_Movements/

How long has she been at anchor in the bay ?