I decided to gather some actual data about the rate at which training grants military skill ups.
I modded dwarves with no eat, no drink, and no sleep so I could just set them into permatraining. I had them dig out a small space to get enough stone to make an armor stand and wall themselves in and the wagon came with enough copper equipment for six dwarves. I checked their skill growth in Dwarf Therapist a few times per season and tried to record increases to skills at an even interval but scrapped that idea in favor of just saying whenever something interesting happened.
Nonstop training, 0 teacher/student
Momuz: Lawful 85, Friendly 69, Leadership 69, Modesty 66, Artistic 38, Perserverance 38, Emotion 27, Nervousness 25, Neurosis 12.
Urvad: Stress 76, Emotion 72, Trusting 70, Friendly 66, imagination 37, compassion 30, Modesty 26, Perseverance 25, Compromising 4
Zasit: Cautiousness 87, Leadership 86, Activeness 67, Modesty 63, Compromising 39, Lawfulness 35, Thinking 31, compassion 29, trusting 28, neurosis 26, company 15
Udil: Depression 75, Optimism 74, Imagination 73, Lawfulness 70, Neurosis 64, Stress 39, Compromising 35
Edem: Imagination 75, Artistic 31, Modesty 30, Urge 30, Stress 25, Optimism 22, Friendly 10
Shorast: Rage 77, Neurosis 75, Leadership 36, Artistic 28, Perserverance 28, Lawfulness 28, Friendly 28, Compassion 25.
mid autumn
Squad A: 4 Shield 4 Dodge
Momuz and Urvad reach 6 axe skill each. Momuz made 70% progress to an increase in shield skill while Urvad gained 4 levels in it. Both have 4 levels of dodge. 8 fighter
Squad B 5 Axe, Newbie
Zasit does not make any suitable progress with axe use and only gains one level of shield and fighter.
Udil gained 2 levels of axe use and the same point in fighter and shield user.
Squad C: 5 Armor, Newbie
Edem gains half a level of armor use, 5 levels of fighter, and 3 axe levels.
Shorast gains 4 axe levels, 4 fighter
, and 2 armor.
Mixed squads A and C. Early Winter
Momuz goes up to 2 armor, 5 shield, 9 fighter, 1 wrestler
Urvad goes up to 5 dodge, 9 fighter
Zasit goes up to 2 shield
Udil goes up to 4 axe
Edem goes up to 5 axe, 6 fighter, 4 shield
Shorast goes up to 5 axe, 1 dodge, 6 fighter, 4 armor, 3 shield, 1 wrestler
Edem and Urvad being in the same group sends their skill levels rocketing up by mid winter. It is obvious that Urvad's fighter skill is going up very quickly while his partner benefits staying about half a level behind him.
Momuz has five levels of teacher, Urvad and Zasit 4. Edem only has 3 levels of student while Shorast has 5. This does not seem to benefit him significantly over the other students.
Late Winter:
Urvad and Edim are Legendary+1 fighters and now seem axe skill is cresting into double digits. Defensive skills have remained lowish.
Early Spring: Edem suddenly has 10 shield skill. Urvad is at 8. Momuz has reached 10 levels of fighter while Shorast follows him at 8.
Mid Spring
I cycle these two into different squads. Edem with Zasit and Urvad with Udil.
Skills are currently:
Edem 13 axe, 3 dodge, 20 fighter, 6 armor, 10 shield, 3 student, 3 teacher.
Zasit 7 axe, 6 fighter, 4 shield, 1 student, 4 teacher.
Urvad 14 axe, 5 dodge, 19 fighter, 3 armor, 9 shield, 3 student, 4 teacher.
Udil 7 axe, 5 fighter, 3 shield, 4 student, 1 teacher.
Late Spring growth
Edem 14 axe, 11 shield, 4 teacher.
Zasit 8 axe, 3 dodge, 7 fighter, 1 armor, 3 student.
Urvad 17 axe, 4 armor, 10 shield
Udil 11 axe, 2 dodge, 13 fighter, 2 armor, 6 shield.
And to give the other two some attention
Shorast 8 axe, 3 dodge, 7 fighter, 3 striker, 3 wrestler, 2 armor, 5 shield, 6 student, 3 teacher
Momuz 6 axe, 5 dodge, 12 fighter, 5 striker, 3 wrestler, 4 armor user, 5 shield, 4 student, 4 teacher.
Whoops, looks like for some reason Momuz had his uniform borked when I last swapped him. He's in all leather junk. Well, let's see if he shoots up after a few seasons.
Late Summer growth
Edem 7 armor, 11 shield, 5 teacher
Zasit 9 axe, 8 fighter, 3 armor, 5 shield, 4 student
Urvad 18 axe, 20 fighter, 4 armor, 11 shield, 5 teacher
Udil 16 axe, 19 fighter, 4 armor, 9 shield, 5 student
Shorast 12 axe, 5 dodge, 17 fighter, 5 armor, 8 shield.
Momuz 10 axe, 19 fighter, 4 wrestler, 5 armor, 9 shield, 6 teacher.
So after a year and a half of ultra-constant training aside from a few equipment mix ups I would have six legendaries. Starting out with weapon skill was not particularly important because neither of the first two dwarves to legendary started with any weapon skill or learned much from others. Shields and Armor seem to Have very little growth besides what is taught until dwarves are very high in offensive skills. Dodging has shown only one level of growth beyond the initial 4 points of it I embarked with and my dwarves spread amongst each other though Momuz is 85% of the way to level 6.
One other thing to note is that with training they all seemed to grow attacked to their weapons and shields in the first few months, well before they seemed to be gaining much skill of any sort.
I will have to embark with some dwarves that already have points in student/teacher to see how big of a difference those make.
So far though this looks like a great case for the old training weapon beat down on recently released wildlife. After you get the painful first few skill levels out of the way training starts to have visually satisfying results.
Unfortunately I forgot to check what kinds of stats they have at the start. At this point they are all in the upper ranges of agility and such.
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I forgot to explain that before that I was going to find out how fast these guys could train new recruits.