So if I'm getting this right, a max of 30 progress/month (10 each from each category) is possible each month?no.. each power gives you +1.... and you can only give +10 from adm or dip or mil each month.
and its drained, if you have less than +10, so you are basically going to 0 quickly in power
for your average monarch there, its 20 years..
With the lowest westernization cost being 6000 (Eastern group is +20%), that's an absolute minimum of 200 months to westernize, or 16 years and 8 months (not accounting for events as I have no clue how common they might be).
Is that about right?