| Level | Warden Office Lv. Required | Upgrade Cost (Cash) | Upgrade Time |
|---|---|---|---|
| 1 > 2 | 2 | 319 | 0:00:20 |
| 2 > 3 | 3 | 383 | 0:00:33 |
| 3 > 4 | 4 | 459 | 0:00:57 |
| 4 > 5 | 5 | 2,067 | 0:03:46 |
| 5 > 6 | 6 | 5,167 | 0:07:08 |
| 6 > 7 | 7 | 10.3K | 0:13:46 |
| 7 > 8 | 8 | 34.1K | 0:19:36 |
| 8 > 9 | 9 | 40.9K | 0:27:02 |
| 9 > 10 | 10 | 49.1k | 0:33:47 |
| 10 > 11 | 11 | 58.9k | 0:40:32 |
| 11 > 12 | 12 | 147.3k | 0:44:58 |
| 12 > 13 | 13 | 176.7k | 0:50:11 |
| 13 > 14 | 14 | 212.1k | 0:59:16 |
| 14 > 15 | 15 | 318.2k | 1:09:10 |
| 15 > 16 | 16 | 381.8k | 1:45:40 |
| 16 > 17 | 17 | 458.2k | 1:52:35 |
| 17 > 18 | 18 | 916.5k | 1:58:13 |
| 18 > 19 | 19 | 1m | 2:32:28 |
| 19 > 20 | 20 | ||
| 20 > 21 | 21 | 4.3M | 3:09:46 |
| 21 > 22 | 22 | 5.2M | 4:07:41 |
| 22 > 23 | 23 | 6.2M | 5:12:05 |
| 23 > 24 | 24 | ||
| 24 > 25 | 25 | ||
| 25 > 26 | 26 | 29.8M | 9:07:08 |
| 26 > 27 | 27 | ||
| 27 > 28 | 28 |