How long can you voluntarily control your blinking for?

I find it interesting reading about all the functions in our own bodies that we can’t control, such as our heart beats and cell devision.

Obviously we all know we can control a few things which are often involuntary i.e breathing, blinking

So I was just wondering, how long could you, or a person in general, actively control blinking for, before forgetting and then realising it has become involuntary again, which would probably repeat the whole process

…

I need to stop procrastinating