Commands that fail generally take zero time. For instance, if
study
is issued for a skill which the location does not offer, it
will fail immediately, and take zero time. The failed study
order will not take a week, and it will not count toward the diminishing
study returns for the month.
Production commands fail immediately if none of their input resources
are available. For instance, recruit
in a location with no
peasants will immediately fail, taking zero time. However, resources
may sometimes become depleted while the command is being executed. In
such cases, the command may fail even after it has spent some time
executing.