How long will rana take for a 7-character npub prefix? It says "estimated pow: 28", but bech32 stores 5 bits per character, not 4, so I think it is pow 35. But how long is that? Sn0wden took 3 days, right? Of course it's totally random, could take much less or more. Breaking and starting again doesn't change anything (even if it feels like it does).