[FabHK]

I'd say between 1e7 and 1e11. 1e5 is too generous, 1e60 is way too harsh.

[yarg]

When a fundamental part of token generation is brute-forcing secure hashes?

[FabHK]

Yes, but you still need, say, one computer to run what Bitcoin does (without the PoW hashing - just checking and recording 5 transactions per second). BTC uses around 15 GW currently, a computer say 15 to 150 W, so we are talking a factor of 1e9 (Giga) to 1e10.