Armor Repairing
The time to repair a fully damaged suit of armor is equal to 25% of the time required to make it from scratch, as specified in book I. If the armor is not fully damaged the time is equal to: (Damage taken)/(total DR) * (time to repair fully damaged suit of armor).
The cost to have your armor repaired by an armorer is 1GC per day, the time required calculated with the above formula.