I've been playing with training times a little in my games, always treading the line between forcing too much downtime between adventures and forcing too many potential adventures that are ticking away and getting worse (or better) on their own. The current state of affairs in the campaign is that characters require one night of rest in a town or other defended position (8 hours) in order to gain the benefits of levelling up (no resting and gaining hp in the dungeon).
Now we're here to talk of training and acquiring new WPs and NWPs. My rule in the past has been that 1 month of uninterrupted training time will grant any WP (3 months of attenuated "every night but also adventuring" time will grant it) while 3/6 months for NWPs is the norm. However, I'm thinking of approaching this from an entirely different stance.
The new rule, effective as of now (I'll let everyone know if the results are catastrophic) shall be based on hourly quotas.
Weapon Proficiencies: Must accumulate 6 months of general use OR 60 hours of training with some other character who knows how to use the weapon.
Non-weapon proficiencies: Must accumulate 120 hours of training with some other character who knows the skill sought or 240 hours of experimentation on the character's lonesome. Language skills can never be learned without a teacher.