| Level | Warden Office Lv. Required | Upgrade Cost (Cash) | Upgrade Time |
|---|---|---|---|
| 1 > 2 | 2 | 174 | 0:00:11 |
| 2 > 3 | 3 | 208 | 0:00:18 |
| 3 > 4 | 4 | 250 | 0:00:31 |
| 4 > 5 | 5 | 1,125 | 0:02:03 |
| 5 > 6 | 6 | 2,813 | 0:03:53 |
| 6 > 7 | 7 | 5,626 | 0:07:30 |
| 7 > 8 | 8 | 18.5K | 0:10:40 |
| 8 > 9 | 9 | 22.2K | 0:14:43 |
| 9 > 10 | 10 | 26.7k | 0:18:24 |
| 10 > 11 | 11 | 32k | 0:22:04 |
| 11 > 12 | 12 | 80.2k | 0:24:29 |
| 12 > 13 | 13 | 96.2k | 0:27:19 |
| 13 > 14 | 14 | 115.4k | 0:32:16 |
| 14 > 15 | 15 | 173.2k | 0:37:39 |
| 15 > 16 | 16 | 207.8k | 0:57:32 |
| 16 > 17 | 17 | 249.4k | 1:01:17 |
| 17 > 18 | 18 | 498.9k | 1:04:21 |
| 18 > 19 | 19 | 598.6k | 1:23:00 |
| 19 > 20 | 20 | 718.4k | 1h 29m 55s |
| 20 > 21 | 21 | 2.3M | 1:43:18 |
| 21 > 22 | 22 | 2.8M | 2:14:50 |
| 22 > 23 | 23 | 3.4M | 2:49:53 |
| 23 > 24 | 24 | ||
| 24 > 25 | 25 | 13.5M | 4:37:29 |
| 25 > 26 | 26 | 16.2M | 4:57:50 |
| 26 > 27 | 27 | ||
| 27 > 28 | 28 |