| Level | Warden Office Lv. Required | Upgrade Cost (Cash) | Upgrade Time |
|---|---|---|---|
| 1 > 2 | 2 | 360 | 0:00:22 |
| 2 > 3 | 3 | 432 | 0:00:37 |
| 3 > 4 | 4 | 519 | 0:01:04 |
| 4 > 5 | 5 | 2,334 | 0:04:15 |
| 5 > 6 | 6 | 5,834 | 0:08:03 |
| 6 > 7 | 7 | 11.6K | 0:15:32 |
| 7 > 8 | 8 | 38.5K | 0:22:08 |
| 8 > 9 | 9 | 46.2K | 0:30:31 |
| 9 > 10 | 10 | 55.4k | 0:38:08 |
| 10 > 11 | 11 | 66.5k | 0:45:46 |
| 11 > 12 | 12 | ||
| 12 > 13 | 13 | 199.6k | 0:56:40 |
| 13 > 14 | 14 | 239.5k | 1:06:55 |
| 14 > 15 | 15 | 359.2k | 1:18:05 |
| 15 > 16 | 16 | 431.1k | 1:59:18 |
| 16 > 17 | 17 | 517.3k | 2:07:07 |
| 17 > 18 | 18 | 1m | 2:13:28 |
| 18 > 19 | 19 | 1.2m | 2:52:09 |
| 19 > 20 | 20 | ||
| 20 > 21 | 21 | ||
| 21 > 22 | 22 | 5.9M | 4:39:38 |
| 22 > 23 | 23 | 7M | 5:12:56 |
| 23 > 24 | 24 | ||
| 24 > 25 | 25 | ||
| 25 > 26 | 26 | 33.6M | 10:17:44 |
| 26 > 27 | 27 | ||
| 27 > 28 | 28 |