Hks turbo timer questions

Hi lads rookie question have this hks was on the car when I bought it

Know they are basic enough ie 30 secs countdown and 1 min

But what does this number mean is it to do with engine temps ?

Is there any way to set it to count down automatically (where it know how long to stay on for?)

Think the hks beeps after around 15 mins driving too (or else it me imagining it)

Cheers in advance

Batt voltage in the pic. You can remove the timer if it's annoying you it's not needed anyways . Driving easy for the last few minutes of a drive does exactly the same thing as the timer.

Cheers barry yea hardly use it alrite just tip away for last few km alright
What benifit is there to seeing your batt voltage? ..

Gimmick I think really , very easy to remove it , plug up at ignition, earth and a wire to the hand brake switch