I believe a balance of 1000 PHR would give you roughly 1 stake every three days. But even then, it is on average, meaning you could easily go a week without any stakes, but you could also get 2 stakes in a single day. Over a long time it would average out to one stake every three days.
Is there any information about inputs optimizing (their size) for better PoS rewards??
When I put my lot in, they split down to around 600 phore each and they were they have stayed, I then transfer all rewards to another block ready for staking. I get between 1 and 3 blocks a day with a block size of 600