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.