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

[Android Central Question]

How long does s9+ take to upgrade and is there any way to stop it and on the phone

 

[Rukbat]

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.