And most likely it would be a two person affair - driving that far completely alone is of course doable but more tiring and a tad less fun.
As for timing, aiming for about 700-800km a day (given the low speeds), so depending on the route that would give the duration.
And in terms of season, open to suggestions - if winter would need to either organize soft compound winter tires here (challenging but doable) or do a tire change (soft compound or studded) when crossing into Sweden (European winter tires would not exactly be fun).
I guess in winter an older RWD car might be fun 🧐