Using my program numbers look more optimistic:
on vast.ai single rtx3090 costs 0.414, single rtx3080Ti costs 0.314. I think their performance is similar (maybe paying 25% less for 3080Ti makes sense, I do not know now).
On rtx3090 I measured performance around 3450Mkeys. It gives 58^11/3450000000Mkeys/3600s = 2011807 hours => $832 888
Anyway, the question is where to find - let's say - 6000 cards to solve it in +-2 weeks...