The session is only present 3 times in the hour, the fourth one at 13:00 is in the next hour Anyway, assuming you still want to count different sessions for the same user separately, you can do the ...
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The session is only present 3 times in the hour, the fourth one at 13:00 is in the next hour Anyway, assuming you still want to count different sessions for the same user separately, you can do the stats twice | bin _time span=1h
| stats count by _time, userName, sessionKey
| stats count by _time, userName Depending on what count you actually want, you could also do this | bin _time span=1h
| stats count by _time, userName, sessionKey
| stats count by _time