Well I'll tell you how I manage my turn mostly:
1.
Checking 'droping boxes' info at the start of turn and acting accordingly.
Say I see that priest has died somewhere I go and recruit another to replace it in my specialized guild cities. Then if I see new family member of age i assign him settlement to govern.
Also open building scroll and see what buildings where built and assign new projects from there as it helps save time.
2.
Check if all settlements are building using according tabs, if agents (priests and merchants) are at the max (if not then build/recruit), check financial status and red tape stuff.
3.
Quick check of loyalty, family members positions, assign to govern who and where, build watchtowers/forts where necessary
4.
Agent (priest, spy, assassin, merchant, diplomat, princess) management - this is by far the most time consuming part. I do it in 2 ways:
a) if your empire is small enough (say <20 provinces) you can, as someone earlier told, open (right click) agents tab and sort them. Then press the agent and you'll see its position, then perform mission, go again into agents tab sort again, etc. This is really boring so when my faction is huge I do it in second way
b) try to remember general locations of your agents and just use them where you see them, try to move assassins in wolf packs i.e. as it makes easier to manage
5.
general overview of empire for foreign threats, brigands and pirates - recruit units and act accordingly, try to complete a mission
6.
military action - going into battles - this definitely takes the longest to finish the turn, but is by far the most interesting aspect (like a completely new game side)
7.
press end turn and circle goes again
For me turns untill 1200s (im playing standard 2 yrs per turn) go quite quickly, but later it can be a nightmare as 4 turns can take even 2 hrs. I'm trying to learn other tips too, plz add, cause I really want to finish long campaign more quickly (it usually takes 2-3 weeks for me as I like turtling and play M2TW like 4 hours max a day)
So plz add your own ideas how to shorten managing time
Hope these little managing details helped
Cheers