Here's some basic math. I was asking myself that if I make

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47KB, 945x476px

Here's some basic math.

I was asking myself that if I make +p% gain per time T (e.g. T = 1 month or T = 1 year), how much time (in units of T) does it take till I double my money.

For example, if I make +1% of my money each week, I would need to do this for 69.9 weeks till I'm at 2 x of my money.
Indeed, (1 + 1/100)^70 2.0067.

Similarly, if I make 4% a year, I double my money in 17.673 years.

Maybe you find this list of value

0.1 - 693.494
0.2 - 346.92
0.3 - 231.395
0.4 - 173.633
0.5 - 138.976
0.6 - 115.871
0.7 - 99.3672
0.8 - 86.9895
0.9 - 77.3624
1. - 69.6607
1.1 - 63.3593
1.2 - 58.1081
1.3 - 53.6648
1.4 - 49.8563
1.5 - 46.5555
1.6 - 43.6674
1.7 - 41.119
1.8 - 38.8537
1.9 - 36.8269
2. - 35.0028

4 - 17.673
6 - 11.8957
8 - 9.00647
10 - 7.27254
12 - 6.11626
14 - 5.29006
16 - 4.67017
18 - 4.18784
20 - 3.80178
22 - 3.48576
24 - 3.22227
26 - 2.99919
28 - 2.80785
30 - 2.64193
32 - 2.49664
34 - 2.36836
36 - 2.25425
38 - 2.15207
40 - 2.06004
42 - 1.97671
44 - 1.90089
46 - 1.83161
48 - 1.76804
50 - 1.70951
52 - 1.65543
54 - 1.60532
56 - 1.55873
58 - 1.51532
60 - 1.47477
62 - 1.43679
64 - 1.40116
66 - 1.36765
68 - 1.33607
70 - 1.30628
72 - 1.2781
74 - 1.25143
76 - 1.22613
78 - 1.2021
80 - 1.17925
82 - 1.15749
84 - 1.13674
86 - 1.11694
88 - 1.09802
90 - 1.07991
92 - 1.06258
94 - 1.04596
96 - 1.03002
98 - 1.01471
100 - 1

More generally, if you want to make a factor of x at rate +p% per T, then you need
log(x) / log(1+p/100) · T
time.