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To know how long in seconds one collision can happen, it is only necessary to take the inverse leadings to:
2.08 1014 secondes,
the equivalent of 6 959 560 years.
As this value is huge, we can't give the result as
a frequency: 1 collision every n seconds.
From a statistic point of view this collision can
happen at the beginning or at the end of this calculated time,
then it is necessary to divide by 2 this value for having the average
for several runs.