It all depends on personal preferences, needs and lifestyle.
For me, whenever I work (desk/computer job) or surf the net, I have a pen-style in my left hand (as I used to hold the analogs) and take a puff or two now and then - usually after finishing a paragraph or something. When I am moving around, I generally don't stop to vape. When I am resting (e.g. watching movie), I tend to chain-vape.
One friend I converted sets timer for vaping sessions. I tried that too, but it doesn't work for me.
The bottom line is: listen to your body and fit vaping in your lifestyle.