The #Repair cost is unchanged and is automatically deducted based on how much HP has been repaired on update.
When not having sufficient resources, the repair will not work.
Repair Reach
An AR alone can repair herself and the ship following her.
Each equipped will extend the ships reached.
Adding another AR can also extend the ships reached.
# of AR+
Ships Repaired
1
1, 2
2
1, 2, 3
3
1, 2, 3, 4
4
1, 2, 3, 4, 5
5
1, 2, 3, 4, 5, 6
Notes
The 6th ship can be repaired with Asahi Kai as flagship and 3 , if Akashi Kai is also used alongside.
Repair Speed
By default, the repair speed for each ship follows the above formula,
The 1st repair work may happen only after 20 min since the last "reset".
The timer is "reset" each time the fleet formation is changed (order or ships in it), or the main menu is loaded.
If at least 20 min have elapsed, loading the main menu will reset the timer and repair all eligible ships.
If the timer is reseted by another way, the repairs are not applied,
If more than 20 min have elapsed, the HP recovered can be higher,
If the amount of HP recovery would be less than 1 after 20 minutes, it will be rounded up,
This means ships that take more than 20 minutes to recover 1HP can be repaired faster by Akashi when checking in every 20 minutes, but others will be slower.
Using 2 AR in the same fleet will increase the repair speed:
will extend the ships reached.
as flagship and 3 
is also used alongside.