I don't know exactly how much time it gives you. I do know that I had enough time when I followed the walkthrough.
I found out this about day seven on UHS hints, which I did not know:
Fortunately for you, it's possible to reset the timer. This may be a bug, but it does work. Just return to the laser beam room, so now and then, if you feel things are getting hot.
I haven't tested this myself, but it would be interesting to see if it works.
You might find this helpful too: Pandora Directive Day Seven