I am betting 2~3 days at King's (or Heritage) Wharf at the Dockyards in Bermuda.
The Magic can get there in 1 1/2 days (that is 1 day at sea in either direction), so they could theoretically do 3 days there, but they won't.
Not sure if Bermuda if the Magic will fit as,
- RCL's "Freedom of the Seas" will be there Oct 25-26th, then
- Norw's "Breakaway" will be there Oct 27-29th.
Both 5,000 passenger ships, but I believe the two Wharf's can hold two ships.
Still, the potential for crowds at the Dockyards, and the Bermuda infrastructure (busses & ferries) is there, depending on actual passenger levels on the ships.
And there actually is enough to do in Bermuda for a 2-day docking.
We did a
DCL cruise between NYC to/from Bermuda in 2019, and it was quite nice
There was a mid-sized older RCL ship sharing the wharf (and a smaller Viking ship in Hamilton).
Things to remember:
a) weather in Bermuda in October is FANTASTIC. short'ish days, but warm water
b) North Atlantic can be rough in October as it's the tail end of hurricane season
c) Bermuda is very nice (safe, upscale, polite, well-dressed) but/and also expensive.