How can I calculate how long it would take to find a block based on difficulty, such as 4209023508200000 or 9881855258560000?
Network Difficulty * 2^32 / hashrate = time in seconds to find a block
hashrate= is your hash H/s not K/M/G
example with lbry, your hash is 300MH x 6 gpu= 1800MH=1800.000.000 H/s
(57,181.491 x 2^32)/1800.000.000 = 136.440 sec = 1.57 days