When is evacuation considered under a convenience category?

Evacuation under a convenience category is generally considered to take place "whenever they can" because this implies that the decision to evacuate is based on ease and practicality rather than an immediate need for safety. In this context, the evacuation doesn't stem from an urgent situation, but rather from a perspective of convenience, allowing for a more flexible timeline and decision-making process.

This approach suggests that crew members have the discretion to evacuate at a time that makes logistical sense while considering the available resources and circumstances. The focus here is on the ability to manage the process in a way that minimizes disruption and maximizes efficiency, rather than adhering to a strict timeline or responding to an immediate threat.