| Level | Warden Office Lv. Required | Upgrade Cost (Cash) | Upgrade Time |
|---|---|---|---|
| 1 > 2 | 2 | 288 | 0:00:18 |
| 2 > 3 | 3 | 346 | 0:00:30 |
| 3 > 4 | 4 | 415 | 0:00:51 |
| 4 > 5 | 5 | 1,867 | 0:03:24 |
| 5 > 6 | 6 | 4,667 | 0:06:27 |
| 6 > 7 | 7 | 9,335 | 0:12:26 |
| 7 > 8 | 8 | 30.8K | 0:17:42 |
| 8 > 9 | 9 | 36.9K | 0:24:25 |
| 9 > 10 | 10 | 44.3K | 0:30:31 |
| 10 > 11 | 11 | 53.7k | 0:36:37 |
| 11 > 12 | 12 | 133k | 0:40:37 |
| 12 > 13 | 13 | 159.6k | 0:45:20 |
| 13 > 14 | 14 | 191.6k | 0:53:32 |
| 14 > 15 | 15 | 287.4k | 1:02:28 |
| 15 > 16 | 16 | 344.9k | 1:35:27 |
| 16 > 17 | 17 | 413.9k | 1:41:42 |
| 17 > 18 | 18 | 827.8k | 1:46:47 |
| 18 > 19 | 19 | 993.3k | 2:17:43 |
| 19 > 20 | 20 | ||
| 20 > 21 | 21 | 3.9M | 2:51:24 |
| 21 > 22 | 22 | 4.7M | 3:43:43 |
| 22 > 23 | 23 | 5.6M | 4:41:53 |
| 23 > 24 | 24 | ||
| 24 > 25 | 25 | ||
| 25 > 26 | 26 | 26.9M | 8:14:11 |
| 26 > 27 | 27 | ||
| 27 > 28 | 28 |