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Iron Storages increase overall storage capacity for iron after it is harvested from mines.  As you level up your Stronghold you gain the ability to build more iron storages, specifically at levels 5, 11, and 20.  This means that there is a maximum of 5 storages total that one may have at once.
Iron Storage

Iron Storage Space & Upgrade Costs

Upgrading a unit costs iron.  Each new level for the Iron Storage increases the amount of iron it can store.


Level Storage Provided
1 2,500
2 9,000
3 22,000
4 36,800
5 53,900
6 72,700
7 93,100
8 115,000
9 138,000
10 162,000
11 188,000
12 214,000
13 242,000
14 270,000
15 299,000
16 329,000
17 360,000
18 392,000
19 424,000
20 457 000‬

Level Iron Req Time
2 3,200 1m
3 8,200 4m
4 17,800 15m
5 31,400 40m
6 50,400 1h 15m
7 75,600 2h 10m
8 108,000 3h 25m
9 152,000 4h 55m
10 201,000 6h 45
11 259,000 9h
12 326,000 11h 35m
13 412,000 14h 35m
14 502,000 18h
15 603,000 21h 50m
16 715,000 1d 2h
17 840,000 1d 7h
18 993,000 1d 12h
19 1,146,000 1d 18h
20 1,313,000 2d

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