under the set 1-10 sec per slide feature you should indicate the SUBTOTAL time of all the slides so far, until that point

at the last slide one will finally know the TOTAL time of the final video - without wasting time to process the entire video & download it to find out! That way, one can choose to keep editing down to make shorter versions of a longer video i.e. cut it from 10 to 5min. Yes one can manually write down & total all the slides but are you not about “the easiest fastest” way to make videos? Be truly convenient.