Rupie Mine

The Rupie Mine is a production facility that collects Rupies at set intervals and stores them up to a limit. Only two Rupie Mines can be built initially, but a third and fourth mine can be built at Player Lv. 22 and 34, respectively.

Payback Period

The time it takes for each level of the Rupie Mine to break even, or pay itself off, can be calculated with the following formula:

PaybackPeriod = Cost/(Limit/6 hrs) + max(BuildTime-6 hrs,0)

The first term in the formula calculates the time it takes to cover the cost of the upgrade at that level's income rate. The second term accounts for the time period where potential Rupies are lost because they cannot be collected during construction. Since this only happens when the build time exceeds 6 hours, the second term rejects negative numbers and only keeps zero/positive numbers.

Upgrade Table

Level	Prod. Time	Limit	Cost	Materials Required	Build Time	Payback Period
1	6 hr	800	50	—	3 sec	22.5 min
2	6 hr	850	100	—	30 sec	42.35 min
3	6 hr	900	150	—	1 min	1 hr
4	6 hr	950	200	—	3 min	1.26 hr
5	6 hr	1,000	250	—	5 min	1.5 hr
6	6 hr	1,050	300	1x Light Orb	10 min	1.71 hr
7	6 hr	1,100	350	1x Light Orb	20 min	1.91 hr
8	6 hr	1,150	400	1x Light Orb	40 min	2.09 hr
9	6 hr	1,200	500	2x Light Orb	1 hr	2.5 hr
10	6 hr	1,250	600	2x Light Orb	2 hr	2.88 hr
11	6 hr	1,300	700	3x Light Orb	3 hr	3.23 hr
12	6 hr	1,350	800	3x Light Orb	4 hr	3.56 hr
13	6 hr	1,400	900	3x Light Orb	5 hr	3.86 hr
14	6 hr	1,450	1,000	5x Light Orb	6 hr	4.14 hr
15	6 hr	1,500	1,100	5x Light Orb	7 hr	5.4 hr
16	6 hr	1,550	1,200	8x Light Orb, 1x Radiance Orb	8 hr	6.65 hr
17	6 hr	1,600	1,400	8x Light Orb, 1x Radiance Orb	10 hr	9.25 hr
18	6 hr	1,650	1,600	8x Light Orb, 1x Radiance Orb	12 hr	11.82 hr
19	6 hr	1,700	1,800	10x Light Orb, 1x Radiance Orb	14 hr	14.35 hr
20	6 hr	1,750	2,000	10x Light Orb, 1x Radiance Orb	16 hr	16.86 hr
21	6 hr	1,800	2,200	15x Light Orb, 2x Radiance Orb	18 hr	19.33 hr
22	6 hr	1,850	2,400	15x Light Orb, 2x Radiance Orb	20 hr	21.78 hr
23	6 hr	1,900	2,600	15x Light Orb, 2x Radiance Orb	22 hr	24.21 hr
24	6 hr	1,950	2,800	20x Light Orb, 2x Radiance Orb	24 hr	26.62 hr
25	6 hr	2,000	3,000	20x Light Orb, 2x Radiance Orb	28 hr	31 hr
26	6 hr	2,050	3,200	30x Light Orb, 3x Radiance Orb, 1x Refulgence Orb	32 hr	35.37 hr
27	6 hr	2,100	3,400	30x Light Orb, 3x Radiance Orb, 1x Refulgence Orb	36 hr	39.71 hr
28	6 hr	2,150	3,600	30x Light Orb, 3x Radiance Orb, 1x Refulgence Orb	40 hr	44.05 hr
29	6 hr	2,200	3,800	40x Light Orb, 3x Radiance Orb, 1x Refulgence Orb	44 hr	48.36 hr
30	6 hr	2,250	4,000	40x Light Orb, 3x Radiance Orb, 1x Refulgence Orb	48 hr	52.67 hr
Total			46,400	325x Light Orb, 30x Radiance Orb, 5x Refulgence Orb	16.7 days	—