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| Level | Warden Office Lv. Required | Upgrade Cost | Upgrade Time |
|---|
| 1 > 2 | 2 | 113 | 0:00:07 |
| 2 > 3 | 3 | 136 | 0:00:12 |
| 3 > 4 | 4 | 163 | 0:00:20 |
| 4 > 5 | 5 | 733 | 0:01:20 |
| 5 > 6 | 6 | 1,834 | 0:02:32 |
| 6 > 7 | 7 | 3,667 | 0:04:53 |
| 7 > 8 | 8 | 12.1K | 0:06:58 |
| 8 > 9 | 9 | 14.5K | 0:09:36 |
| 9 > 10 | 10 | 17.4k | 0:12:00 |
| 10 > 11 | 11 | 20.9k | 0:14:23 |
| 11 > 12 | 12 | 52.2k | 0:15:58 |
| 12 > 13 | 13 | 62.7k | 0:17:49 |
| 13 > 14 | 14 | 75.2k | 0:21:02 |
| 14 > 15 | 15 | 112.9k | 0:24:33 |
| 15 > 16 | 16 | 135.5k | 0:37:30 |
| 16 > 17 | 17 | 162.6k | 0:39:57 |
| 17 > 18 | 18 | 325.2k | 0:41:57 |
| 18 > 19 | 19 | 390.2k | 0:54:06 |
| 19 > 20 | 20 | | |
| 20 > 21 | 21 | | |
| 21 > 22 | 22 | 1.8M | 1:27:54 |
| 22 > 23 | 23 | 2.2M | 1:50:45 |
| 23 > 24 | 24 | | |
| 24 > 25 | 25 | | |
| 25 > 26 | 26 | 10.5M | 3:14:09 |
| 26 > 27 | 27 | | |
| 27 > 28 | 28 | | |