Once my s9 plus starts upgrading , how much time does it take and how can i stop it inbetween

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Android Central Question

How long does s9+ take to upgrade and is there any way to stop it and on the phone
 
To Pie? As long as it takes, but you can use the phone until it finishes updating. Then you have to restart it.

You can't stop it. That will leave you with a partial operating system, which won't start.