why the difference in timers for wh space and hisec / null sec
armor layer is taken down, this shuts down structure services
The duration of the Invulnerable state between attacks is:
24 hours from shield to armor, then 6 days from armor to hull for any structure outside wormhole space
24 hours from shield to armor, then another 24 hours from armor to hull for structures inside wormhole space
Mostly because wormhole space geography dictates keeping hole control over a system when attacking in order to maintain access as well as keep your enemy/target from bringing in reinforcements. This requires 24x7 effort by the attacker and dragging that out over a week or more using timers like in kspace would be unbearable.