At 300, it's about 11 days between blocks on average (likely a bit shorter in practice)

Normally a block reward is split across the past 8*difficulty work performed. But that much work hasn't been done yet, so early miners would get a higher payout for a while 

 What do you mean by "past 8*difficulty) ?
 

 The expected work to find 8 blocks 

 Fantastic. What’s the payout threshold? 

 Currently 10 TBC (0.01048576 BTC)

Planning to make it configurable