How long do naval units take to repair? (bug?)

[VonWulfen]

Hello all.
I have a couple of subs sitting in a fully supplied port and set to prioritize for reinforcements.
Its been a few turns now and they don't appear to be gaining new crew.
How long does repair and reinforce normally take on naval units?
Edit; I think there may be a bug. They have not increased they're Strength in over 5 turns now.

[AlvaroSousa]

How much do you have toward repairing units? Also be aware what it takes to repair a unit.

I think a sub is 220 in 1939 for Germany with 1940 tech.

1 health = 20% of its strength = 44 production. 44 * repair cost over build multiple = 44 X 60% = 26 production.

So be sure you allocated at least this amount and the sub is in a port size 5 or greater.

[VonWulfen]

Many thanks.
It has been around 10 turns now one sub unit stuck at 3/5 the other at 4/5.
The supply port is 9.
How do I manually allocate reinforcements?
I have set to priority reinforce and repair/upgrade is on.