| Level | Warden Office Lv. Required | Upgrade Cost (Cash) | Upgrade Time |
|---|---|---|---|
| 1 > 2 | 2 | 185 | 0:00:12 |
| 2 > 3 | 3 | 222 | 0:00:19 |
| 3 > 4 | 4 | 267 | 0:00:33 |
| 4 > 5 | 5 | 1,200 | 0:02:11 |
| 5 > 6 | 6 | 3,000 | 0:04:09 |
| 6 > 7 | 7 | 6,001 | 0:08:00 |
| 7 > 8 | 8 | 19.8K | 0:11:23 |
| 8 > 9 | 9 | 23.7K | 0:15:42 |
| 9 > 10 | 10 | 28.5k | 19:37 |
| 10 > 11 | 11 | 34.2k | 0:23:32 |
| 11 > 12 | 12 | 85.5k | 0:26:07 |
| 12 > 13 | 13 | 102.6k | 0:29:09 |
| 13 > 14 | 14 | 123.1k | 0:34:25 |
| 14 > 15 | 15 | 184.7k | 0:40:10 |
| 15 > 16 | 16 | 221.k | 1:01:22 |
| 16 > 17 | 17 | 266k | 1:05:23 |
| 17 > 18 | 18 | 532.1k | 1:08:39 |
| 18 > 19 | 19 | 638.6k | 1:28:32 |
| 19 > 20 | 20 | ||
| 20 > 21 | 21 | 2.5M | 1:50:11 |
| 21 > 22 | 22 | 3M | 2:23:49 |
| 22 > 23 | 23 | 3.6M | 3:01:13 |
| 23 > 24 | 24 | ||
| 24 > 25 | 25 | ||
| 25 > 26 | 26 | 17.3M | 5:17:42 |
| 26 > 27 | 27 | ||
| 27 > 28 | 28 |