systemd

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targets

network-online.target

See systemd docs If systemd-networkd and NetworkManager are running in parallel, both NetworkManager-wait-online.service and systemd-networkd-wait-online.service must start so that network-online.target is reached. Most of the the time you will only use one which leads to the other one reaching a timeout, delaying the network-online.target. So just disable the other one.

timers

transient user timer: 

systemd-run --user --on-active=5 --on-unit-inactive 600 /path/to/executable
* --on-active: seconds to first run * --on-unit-inactive: seconds to wait for next run after completion