I think you'll find that your mileage may vary with that question, [member="Mantic Dorn"].
Some people here like training threads, and they may have a set number of threads or posts in those threads -- which may be what you're wanting.
I'm not much of a training thread person. I do them on occasion, but I prefer to develop my characters in more story-based writing. So, for example, when I started writing this character he only knew Form I (Shii-cho), which is the introductory lightsaber form that teaches the basics of lightsaber combat. Over the course of several threads, only one of which has been a training thread, Zak's not only mastered the basics of Form I but gone on to become a practitioner of Form II and Form V.
Here's how the break-down worked for me, keeping with that example.
1st Thread: A social thread, in which Zak participated in a velocity and lost; then got advice from some of the older padawans on what he could have done differently.
2nd Thread: A spar/duel with Nefertari Sovint (who became Zak's master in the same thread); who also introduced him to Makashi to help him with his footwork and form
3rd Thread: A dominion, in which Zak has progressed to be more in control of his lightsaber and is able to use Shii-cho blast deflection easily. At this point, I have both Shii-cho and Makashi on Zak's sheet, with Shii-cho being his primary form and Makashi being an influence on his technique.
4th Thread: A duel with Megan Rhymes, who comments that Zak's Shii-cho rivals some Jedi Knights. As part of the thread, Zak is using Makashi footwork whilst experimenting with Djem So, but he keeps having to switch back to Shii-cho because he's too inexperienced with Form V.
5th Thread: A Djem So training thread, in which Zak is now using Makashi in place of Shii-cho because of how his bladework has evolved. This thread went on for more than 40 posts, as a result of which (being so substantive), I replaced Form I with Form V as Zak's primary form.
So, in 5 threads, only 1 of which was a dedicated training thread, we've arrived at a padawan who knows Djem So and Makashi, and has demonstrated a progression of skill and talent across a range of stories.
To use a different example, my Primeval witch uses Cryokinesis but I've never done a thread or story about him training it. Instead, I've built it up over a number of posts.
1st Thread: Dominion, reference to his aura or presence sending chills up those around him.
2nd Thread: Dominion, reference to the temperature dropping around him when he uses the Dark Side.
3rd Thread: Dominion, reference to frost forming on his body or at his feet when he uses the Dark Side. At this point, I've added Cryokinesis to my list of skills/spells that my witch can use.
4th Thread: Skirmish, uses Cryokinesis to create and hurl a snowball at Micah Talinth.
Once again, and this time indirectly, I can show a progression of how my character came to develop and hone that particular ability.
But, it need not be 5 threads, or 4 threads. I did one training thread for Force Light and then wound up using the ability in a subsequent thread even though the training thread was still on-going.
Different people are likely to come up with different answers, based on the particular ability, and their own opinions/experiences. I'd be skeptical of a padawan using Alter Environment or Force Lightning, but that's me and someone else may think differently. Chaos is all very freeform and so... it's whatever you make of it, or whatever you want it to be.
