Average hashes per block is decided by the network difficulty.
That's what the % number is on the top of every page after 'Shares:' - how much of the network difficulty, average work per block, we've done.

Time isn't much use since the hash rate changes quite a lot.
But the reverse of that, at the moment, it's currently: 11.23PH/s is expected to find, on average, one block a day.
Thus 44.9PH/s is expected to find, on average, 4 blocks a day.
The pool is somewhere in the ballpark of that, but the hash rate is often below that.