Can’t decide how to split up Helsinki/Stockholm/Copenhagen

Slightly stuck on how to split up 10-12 days later in the year between these Nordic cities.

Here’s my schedule for now

Helsinki - arrival (afternoon) + 1 full day

Overnight ferry to Stockholm

Stockholm - arrival (morning) + 2 full days

Train to Copenhagen

Copenhagen - arrival (afternoon) + 3 full days + departure (afternoon)

It’s going to be in mid-late summer but haven’t fully decided yet

Let me know if you think that’s roughly right for each one + any suggestions