Based on the pool hash rate, easier to think hours.
Just repeating what has been said with do it yourself formulas.
Pools total block solving hash power in blocks per day = (rate * 86400 * 65535 / ( difficulty * 2^48 )
Hours to solve a block in Excel sheet for 5PH @ current difficulty "=24/(5000*1000*1000*1000*1000*86400*65535/(79102380900*POWER(2,48)))"
18.9 Hours. Lucky if pool average less than that over 5 blocks.
Pay out is distributed over 5 blocks 20% each = 3.8 days
excel formula :: "=5/(5000*1000*1000*1000*1000*86400*65535/(79102380900*POWER(2,48)))"
One of these two number should show dynamically at the top
If you hash continuously you will see PPS like number on the fifth solved block.
If you stop you will get payout for through next 5 block, slowly diminishing, with the last one being 1/5 of the PPS.
20%,40%,60%,80%,100%,100%,100%.....(stop hashing), 80%, 60%, 40%, 20%
I added the 'ramp' time to the Help->Payouts page earlier.
Just fixed it now (it was displaying the days/hours wrong)
It's actually:
"The pool hash rate for the last day is roughly 4.94PHs which means the 5Nd 'ramp' is roughly 3days 23hrs"
However, since it is in no way guaranteed to be accurate, I don't want it in the main page header.
Also, the number of blocks isn't how you work it out since blocks don't appear every 100%
It is simply the 5Nd value and that's the only accurate value
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Edit: and to show a good example of that inaccuracy
I just processed the payout for 388591
The actual payout range:
Elapsed Time 4d 8hr 6m 24s
and of course if you look on the Account->Rewards page it says that also: 104hr 6m 24s
The reason, well to get 5Nd shares it had to go back to when the hash rate wasn't 5PH
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Payout 388591 sent
5468dedb034110f002eb098a0e0dd8352202d3f93f6466b3c432ac52e27b0d79
but not confirmed yetand confirmed
) 
