ExploderWizard
Hero
I don't bother with training requirements generally. HP are gained immediately once the XP total is reached and all other level benefits take place after a long rest. The only exception to this is when taking a level in a new class. I go with the assumption that the fundamentals of a new class are learned over time prior to becoming a 1st level adventurer. Once the basics are mastered, continuing along that same path can be assumed to occur with experience and use of those abilities.
A new class involves learning the fundamentals from scratch. Therefore the first level in a new class requires 250gp initial training and 250 days, half of which require an instructor (which can be a PC of the appropriate class) and half of self study/practice time. Thereafter any new level gained can be applied to either class normally.
Thus multi-classing requires dedication and time that single classed characters don't have to worry about.
A new class involves learning the fundamentals from scratch. Therefore the first level in a new class requires 250gp initial training and 250 days, half of which require an instructor (which can be a PC of the appropriate class) and half of self study/practice time. Thereafter any new level gained can be applied to either class normally.
Thus multi-classing requires dedication and time that single classed characters don't have to worry about.