Come to think of it that does sound about right.
Also the language in the help menu suggests only classic can have multiples outside of berserker risk shenanigans.
Doubles were pretty fun though.
EDIT: Made up my mind. 5 runs to start with using two different accounts as last year, so two runs going at once. The first one I'll talk about on this thread and start immediately when the challenge begins, playing the other one in my spare time.
1. RANDOM, NATURAL, BERSERKER RISK.
2. BERSERKER RISK
when those two are completed.
3. RANDOM
4. NORMAL
I'll switch off every crystal and then at key points during world 2 (Getting the party together, Dragon Mountain, Barrier Tower, Forest of Moore, Exdeath's Castle) and every tablet in world 3 (I pretty much always get them all)
and when one of those is done I'll do a
5.CLASSIC
run.