PSA: how to annex subjects faster if you have money or diplomatic hegemon

You can "seize territory" from vassals and fiefdoms for 20 liberty desire, which will decay away in 40 months. So as long as you can keep them above 50 loyalty, you can seize one location from EACH subject once per 40 months. If you have 20 subjects, that's one location every 2 month. (6 per year). This will help you annex much much faster. Try to seize cities because they increase the annex cost more. Another cost though is diplomat.

You can already do this regardless, but if you have a lot of money, max out diplo spending so you get a lot of diplomat and subject loyalty. If you have diplo hegemon, do the corp cabinet action to get a lot of diplomat.

Don't forget to keep the loyalty of subjects being annexed above 50 so your progress is not halted. If something goes wrong, you can also do support loyalist diplo action to boost loyalty by 20.