what experience do your troops have in the end-game?

[FactionHeir]

Ship experience goes up very quickly if you autoresolve. Playing naval battles manually, I never managed to get even 1 chevron added to my fleet.

Land battle experience goes higher faster if you play manually as you take fewer losses. I would recommend autresolve siges though so that all enemy units are accounted as kills to your units rather than lost somewhere.

Note that ships cannot lose men (and thus experience) unless the ship sinks, in which case its gone. That's why they can gain experience very quickly and don't lose any from replenishment.

Replenishment in the field and in settlements always takes base xp0 units, even if your city can produce xp2/3

The very highest land xp I had was 4, and that unit had about 30 men (out of 80).
The very highest naval xp I had was 7.