btw i can offer 115bit range only 1 key, for make this key i need 0.75btc for buying 3090rtx gpu's for my calc fast to within 7 days 
, but here no one have this for work of months to days
, but here no one have this for work of months to days I've been puzzling over your way of reducing the number of keys to 16/260 and 1/720 for two weeks now)))
You write that for 1 key of 115 bits it takes 7 days for 3090. How much time does it take to compress to 260 and 720 keys?
Thank you
Based on my experience the compression happens almost instantaneously since you just make 260 or 720 passes in a loop respectively.
I'm not sure I can believe the time to crack is that fast for a single 3090, what's most likely happening is that he's running a bunch of them in parallel. Otherwise #120 wouldn't be so hard to solve and could be done with a GPU farm full of 3090s.