How I can rotate Part with second, example Camera:Interpolate

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#1

I want rotate Vector3.new(0,-15,0) in 0.5 second but I dont know How I can make
Camera:Interpolate is making camera to another camera in 0.5 or more or less,

How I can make ?

#2

I found How I can make my wanted

#3 
Vector3.new(0,-15,0) * deltaTime/2 -- put in heartbeat