you really need to work on your research skills and base on what I know china may not be part of them but the other countries for sure still counts are the main host of asics minere
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https://www.sunbirddcim.com/blog/largest-bitcoin-mining-farms-world
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Where can buy Asics?
if there is a chance to do a google search "where to buy ASICS" there can be a chance you have it in your hometown mall and if you can go anywhere online lazada or shopee?
The average time a asics is "alive"?
From What I know it's 24/7 its alive and it is said that 3 years it would be good and amazing.
here is answer base from research https://www.guru99.com/best-bitcoin-miner.html and as I am not a veteran here is what I can only suggest if the majority of the people answered if in the product