Clay pit

In the clay pit your workers extract clay, which is important for new buildings. The higher its level the more clay is produced.

Note that the production per hour is affected by World Speed. For example, if you're playing a world with 2x speed then the production per hour will be double the values listed in the table.

Maximum Level: 30

Level	Requirements	Workers needed for upgrade level/total of workers	Production per hour
1	65 50 40	10 / 10	30
2	83 63 50	1 / 11	35
3	105 80 62	2 / 13	41
4	133 101 76	2 / 15	47
5	169 128 95	2 / 17	55
6	215 162 117	2 / 19	64
7	273 205 145	3 / 22	74
8	346 259 180	3 / 25	86
9	440 328 224	4 / 29	100
10	559 415 277	4 / 33	117
11	709 525 344	4 / 37	136
12	901 664 426	5 / 42	158
13	1.144 840 529	6 / 48	184
14	1.453 1.062 655	7 / 55	214
15	1.846 1.343 813	8 / 63	249
16	2.344 1.700 1.008	8 / 71	289
17	2.977 2.150 1.250	10 / 81	337
18	3.781 2.720 1.550	12 / 93	391
19	4.802 3.440 1.922	13 / 106	455
20	6.098 4.352 2.383	15 / 121	530
21	7.744 5.505 2.955	16 / 137	616
22	9.835 6.964 3.664	20 / 157	717
23	12.491 8.810 4.543	22 / 179	833
24	15.863 11.144 5.633	25 / 204	969
25	20.147 14.098 6.985	28 / 232	1127
26	25.586 17.833 8.662	33 / 265	1311
27	32.495 22.559 10.740	37 / 302	1525
28	41.268 28.537 13.318	42 / 344	1774
29	52.410 36.100 16.515	48 / 392	2063
30	66.561 45.666 20.478	55 / 447	2400