It's actually not a biggie. Rent 50 RTX 4090s and you can easily hash whatever 1.15 pentilion keys. OK, not really "whatever", but grouped in decently sized subranges, for maximum efficiency with minimum overhead. Like, for example 4.2 million whatever ranges each of size 2**38. That's around 40 seconds to scan a range, which is a good trade-off at the high-level management layer and the expected resilience, connectivity, etc.

That's easily just 5 machines each having 10 RTX 4090 attached.

It's over in 38 days. Down side? You'll need around 3200 bucks to do it and a very good discount from GPU farms.

Breaking #71? Repeat the above 1024 times (or 512 times to get the chances go beyond 50%).

Set and forget. People who argue breaking keys takes effort and energy - sure, but not on the people, once all the pieces fit together. Nothing much to improve really from that point on, but simply pay the bills, and then maybe complain on the forums your life's been destroyed.

Good luck.