Hi @igiri ,
So from my experience, there is no time limit for the exams and you can submit your solutions as many times as you want as long as you don’t view the solutions after you submit.
here is a moderator’s reply about the same: time limit for exams and number of attempts
The feedback at the end of the exams is still a feature request and you can go and vote for it here: feedback after exams
Have a great day 
.!