Puzzle Rush Survival . (Can i take rest???)

Hello! , i love solving chess problem. I have done a few times the puzzle rush survival mode

 I have realized that if you close the windows without pressing the botton leave Chess.com save your progress.  Considering this i wonder:  is it ok if i take some rest when i feel tired and then continue?.  i feel the problems are great but at the end you are just tired!.  

When you enter in the  problem 40 i think 1 problem per day is Excelent!.  (I want to know if it is ok to do the puzzle rush survival in that way) . Thank you!

I remember reading that there was a timer and that you couldn't take more than 8 hours.

https://www.chess.com/clubs/forum/view/puzzle-rush-survival-resume-function

Thank you jastbefair!. i will check that out. also i have written to the staff .

I my case i spent like a week doing problems (one per day). So i think it must be longer than 8 hours. 

That thread I posted had an answer from the staff- JD Cannon. 

They might have changed it since but I am pretty confident that that answer was correct.