I use training for virtually all skills. During this time, no other activities can be undertaken and it assumes that training is daily for a minimum of 8 hours/day.
Here's what I do:
Base time to gain skill (rank 1):
Physical - 2 weeks (or 14 days)
Intellectual - 4 weeks (or 28 days)
Modifiers
- stat bonus/penalty for relevant skill of student = +/- 1 day/point (natural aptitude)
- stat bonus/penalty of INT and WIS of student = +/- 1 day/point (quality of student)
- stat bonus/penalty TOTAL of TEACHER for INT and WIS = +/- 1 day/point (quality of teaching)
At the conclusion of training, a DC 12 roll is made with all current bonuses to enable success. A critical fail indicates you haven't successfully learnt the skill, whilst a natural 20 indicates an additional rank has been achieved.
Example:
Balto wishes to learn Escape Artist from a travelling acrobat who is in town for a short while. He convinces the acrobat to tutor him, for a price.
Training Time
Balto has 10 INT, 12 WIS and 17 DEX = total modifier of +4 (which will remove 4 days from the base time of 2 weeks)
The Teacher has 14 INT and 8 WIS = total modifier of +3 (which will remove 3 days from base time)
So, Balto will learn enough to gain 1 rank in Escape Artist in 7 days. At the end of day 7, he rolls a DC 12 check, adding his dex modifier. If he makes it, all done. If he fails, he can try again in another 7 days. If he rolls a natural 20, he gains 2 skill ranks.
I usually ensure payment is up front, so Balto could maybe try to get a refund for his second week of training should he not need it, but I doubt his trainer will agree to that
You can consider circumstance penalties if the training is for less than 8 hours/day, or other activity is occurring, or whatever.