Resume timer in a quiz

Hi,

I've made a final evaluation of one of my courses with storyline and with the option "always resume" I allow my students to take the test just once!

My problem is that when the student returns to the test he did not finish before, the timer starts over from the beginning...

This is annoying because if I gave them 10 minutes to answer 20 questions, the student can answer 19 questions in 9 minutes, get out of the test, go back into it and have 10 more minutes to answer the last question...

Can you help me out?

Thanks,

Karine