Hi @mattheuslima,
let me understand:
you want to timechart the average duration in a timeframe of 15 minutes with span=1m,
in the transaction, you want to thake the earliest time,
is it correct?
If this is your need try something like this (that's faster!):
(index=a) OR (index=b) earliest=-15m@m latest=now
| bin span=1m _time
| stats earliest(_time) AS _time avg(duration) AS duration count BY Reg_ID
| timechart avg(duration) AS media
Ciao.
Giuseppe
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