I suspect you need to change your code:
string msg = "Your session will expire in 10 minutes. \\n Please save your work to avoid this.";
And exit \n, otherwise the output code will actually include a line break, not\n
Your output code will look like this:
setTimeout('alert("Your Session....
Please save your work to ....");', 1000);
Instead
setTimeout('alert("Your Session....\n Please save your work to ....");', 1000);
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