Main Building is upgraded and used to get men faster, which are used to upgrade nearly everything in the game. Upgrated Main Building will reduce other buildings upgrede time.
level
x%reducebuildingupgradetim
person production
capacity
upgrade completed time
upgrade prestige
0
5
50
N/a
N/a
N/a
N/a
N/a
N/a
N/a
1
8
80
550
800
750
250
2
0:41:40
8
2
14
140
705
1,025
960
320
3
0:50:50
10
3
23
230
900
1,310
1,230
410
5
0:59:02
12
4
35
350
1,155
1,680
1,575
525
8
1:08:39
16
5
50
500
1,450
2,080
2,000
680
13
1:20:14
20
6
68
680
1,890
2,750
2,575
860
18
1:30:00
26
7
89
890
2,420
3,520
3,300
1,100
25
1:42:55
34
8
113
1,130
3,095
4,505
4,220
1,405
33
1:57:04
43
9
140
1,400
3,965
5,765
5,405
1,800
42
2:12:34
53
10
170
1,700
5,075
7,380
6,920
2,305
52
2:31:41
65
11
12
13
14
15
16
17
18
19
20
639
6,390