In approximately 111.11 days.

Math:

95% * 21,000,000 = 19,950,000

20,000,000 - 19,950,000 = 50,000

Block reward = 3.125 per block,

6 blocks per hour

50,000/3.125 = 16,000 blocks to be mined

16,000/6 = 2,666.667 hours to mine 50k ₿

2,666,667/24 = 111.11 days to mine 50k ₿