20 samples at 3 days, of which:
12 success
3 Data not found (= top SSK not found)
5 Not enough data found (= CHKs in the splitfile were lost)

:|

This gives a 60% success rate. 20 samples implies a 95% confidence interval of 
22% i.e. we can be 95% confident that the success rate for 4 block splifiles 
with an SSK top block, inserted and then fetched 3 days later, is between 38% 
and 82%.

For 1 day:

18 success
3 Data not found
2 Splitfile error

Gives 78% success, 95% confidence interval of 57% to 99%.

For 7 days:

9 success
5 DNF
3 ADNF

Gives 52% success, confidence interval 29% to 77%.

AFAICS there is still not enough data to compare 3 days to 7 days.

Clearly we need to look at single block success and gather a lot more samples 
per day!!
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