Macbook as a permanent WiFi router

Hello there!
I have recently started using the Internet Sharing via WiFi on my MacBook Pro.
There are some questions that bother me :
1. Is it ok to use MacBook Pro as a permanent WiFi router ? Is the MacBook WiFi chip reliable enough to keep tethering as hotspot for like 10~12 hrs daily and still have good life?
2. Suppose if the chip in some way stops working, what be the cost for replacing the same? I am having MacBook Pro 13 Mid-2012 model.
3. Are there any health risks related to sitting so close to router?
Hope someone would enlighten me on these issues.
Thanks.

Can anyone share their views please.
Thanks in advance.

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============================
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Macbook as a permanent WiFi router

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