Recovery time
Overview
When a soldier gets injured in combat, the soldier is put off duty and goes on medical leave for a certain number of days. Sometimes the number of days can be ridiculously high, and at other times it may appear to not even exist. If injured troopers are assigned to a transport, they will be removed. Once the soldier has healed, they'll go back on duty, but must be manually reassigned to a transport.
Formula
The number of days a soldier will spend in recovery ranges randomly from
(Health Lost * 0.5) to (Health Lost * 1.5)
Therefore, a soldier returning from a mission wounded for 10 HP will be in recovery from 5 to 15 days. A genetically mutated über soldier D with 254 lost hitpoints (out of 255) will stay in bed for a grand total of 127 to 381 days. With power comes a price. With ultimate power comes the ultimate price.