You see the same thing with e.g. cron jobs, where everyone schedules on xx:00 or xx:30. No communication needed, it's just natural. More senior people recognize this and add randomness to their start times or skew a bit.
replyI always recommend to use weird numbers for different tasks. That way, you can see "oh my system is under severe load at *:13 (or 17, 23, 42, ...). That must be this cron job"
replyYou ought to use RandomizedDelaySec=xxx
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