Engineers
These engineers can only be used to prepare your parts against wear !
You have the choice to recruit them 1 by 1 up to 10 by 10, for a period from 2 to 30 days.
Of course, their cost is cheaper if you recruit them for a longer period.
Eg : 2 engineers for 4 days cost 2240 CR, that is to say 280CR/engineer/day
2 engineers for 10 days cost 5000CR, that is to say 250CR/engineer/day
Each engineer can only prepare one part a day !
You cannot have more than 10 engineers at the same time
On the other hand, ®unner options will allow you to get up to 5 supplementary engineers, in exchange of PR.