Save time in a table

Hi people!

I have a doubt and I think someone from here have the soluction.

In the picture I add you can see a "result" , this is the time 00:00:00.000 and when the max value is less than 4,5 start time if not reset the time.  I want to save this time in a table but...I'm bit confused...

I have to use a shift register or what..?

Any idea?

thanks,