If you do at - let's say - 10:35:15 a |timechart with span=1m over last 5 minutes, you'll get data from 10:30:15 to 10:35:15 split into a minute-long buckets, aligned at full minutes. So you'll get 6 buckets - one containing events from 10:30:15 to :10:31:00, another one from 10:31:00 to 10:32:00 and so on up to 10:35:00-10:35:15. Obviously, the first and last buckets will be smaller than the rest of them. That's the default behaviour of the |timechart You can however use partial=f option for |timechart wich will omit the not-full first and last buckets from the result. In our example case you'd get only four buckets - 10:31-10:32, 10:32-10:33, 10:33-10:34 and 10:34-10:35.
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