Greetings,
while my vote goes to the DBMS solution, I would like to point out that, if the only question you want an answer
to is "how many", you just need to record the time at which variations happen, without no "granularity" at all (and the data set gets much smaller.
This means, keep a running count of sessions and, whenever someone logs in/out update it and write it down (to a db table, for instance). This data should be enough to answer all the questions of the form you mentioned.
Cheers,
alf
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