crond.service restart=always

[Frank Murphy]

Very occasionally crond fails # for whatever reason,
Restart=always # kills it due to restart too fast

What would be considered a suitable "wait" period before restarting?
http://www.freedesktop.org/software/systemd/man/systemd.service.html
RestartSec=

    Configures the time to sleep before restarting a service (as
    configured with Restart=). Takes a unit-less value in seconds, or a
    time span value such as "5min 20s". Defaults to 100ms.

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Regards,
Frank 
www.frankly3d.com