# Repair and Maintenance

$$
x\_r=Lay\_{n}=Lay~~Mining~~per\~Day\[Lev.\alpha]
$$

$$
Refair\~Cost=x\_r\*((100-Durability)/10)
$$

Buildings produce less $Lay 007 after a certain amount of time. As a result, building owners need to constantly repair their buildings. The cost of repairing a building depends on how much $Lay 007 it produces, and owners can only repair it if they pay for it.

| Durability            | Mining Efficiency |
| --------------------- | ----------------- |
| 90 < Durability ≤ 100 | 100%              |
| 80 < Durability ≤ 90  | 90%               |
| 70 < Durability ≤ 80  | 80%               |
| 60 < Durability ≤ 70  | 70%               |
| 50 < Durability ≤ 60  | 60%               |
| 40 < Durability ≤ 50  | 50%               |
| 30 < Durability ≤ 40  | 40%               |
| 20 < Durability ≤ 30  | 30%               |
| 10 < Durability ≤ 20  | 20%               |
| 0 < Durability ≤ 10   | 10%               |
| Durability = 0        | 0%                |

{% hint style="info" %}
**Note: A building's Durability is reduced by 0.1667% for every 'Get Lay' (based on 4 hours).**
{% endhint %}

{% hint style="info" %}
**Note: When a building is leveled or tiered up, it is constructed as a new building(100% Durability).**
{% endhint %}

{% hint style="info" %}
**Note: Please note that all figures are subject to change by governance.**
{% endhint %}

{% hint style="danger" %} <mark style="color:red;">**Note: Keep in mind that all tokens and NFTs spent on the upgrade are irrevocable and non-refundable.**</mark>
{% endhint %}