Updating due to phrase "Defaults to DefaultTimeoutStartSec= from the manager configuration file, except when Type=oneshot is used, in which case the timeout is disabled by default (see systemd-system.conf)" from [0] https://github.com/systemd/systemd/blob/master/man/systemd.service.xml
<varname>TimeoutStopSec=</varname> and
<varname>RestartSec=</varname> (for services, see
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details on the per-unit settings). For non-service units,
+ for details on the per-unit settings). Disabled by default, when
+ service with <varname>Type=oneshot</varname> is used.
+ For non-service units,
<varname>DefaultTimeoutStartSec=</varname> sets the default
<varname>TimeoutSec=</varname>
value. <varname>DefaultTimeoutStartSec=</varname> and