The block times are about a minute each.  So there are roughly 1440 blocks per day or about 10,080 per week. 

MATH:

Second PoW / PoS phase starts at 50,000 block.
We are at  18,745.
50,000-18,745 = 31,550 blocks left

31,550 / 1440 = 21.7 days. (Not exact but probably close)

These are my calculations based on info on the home page.

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