Seriously wounded is the highest level. Sorry I didn't see that part. There is some variation within the definition of a serious wounded though, so for the same character two serious wounds would take different times to heal.
That's just not true though. There is a level above serious wound "Critical Wound" where the text says something like the healers aren't sure that you're going to live? The progression from worst wound to lightest is Critical, Serious, Wounded, Light Wound, Healing, Recovery, Normal.
Right now at least on Stable (and presumably Testing islands) Assasins blades only do serious wounds.
Text goes like this for the different statuses.
Wounds Unchanged (16 days, 9 hours ago)
Your wounds are critical, and you spend most of your time unconscious. You get occasional flashes of what the healers are doing: enough to know, when you're lucid enough to think straight at all, that your chances aren't good this time.
Wounds Healing (14 days, 9 hours ago)
The healers say your condition is improving.
They tell you that they have the internal bleeding stopped, and hope that they'll be able to bring down your infection soon.
Your wounds are still very serious, and you are slipping in and out of consciousness. The healers are doing their best, and say they think you will probably recover, but they cannot tell you how long it may be.
Wounds Healing (13 days, 21 hours ago)
The healers say your condition is improving.
They tell you that the infection is going away, and you should be better in a few more days.
You are still wounded, and the healers say you should make a full recovery, as long as you stay in bed for a few more days.
The healers say your condition is improving.
In fact, they think you're well enough to be allowed to resume limited duties.
You are recovering from your wounds, and able to act and send messages, though you can't do as much as usual in a day.
Wounds Healing (12 days, 21 hours ago)
The healers say your condition is improving.
You are recovering from your wounds, and able to act and send messages, though you can't do as much as usual in a day.
Returned to active duty (12 days, 9 hours ago)
You have returned to active duty. You are in Lyton.
It will take about 6 days for your wounds to fully heal. During this recovery time, you receive two hours less per turn.
As you can see he my noble (who was 30ish) would've been really knocked out and not dead (Although funnily enough his status was Dead when I first logged in after the battle in Atamara).