If you extract the scripts folder from Data0.pak, in the scripts/challenges folder, there are files named like autocompetitions, challengesoldtown, challengesoldtown_poster, challengesslums and a few with storycompetition in their name, and if you edit all the Duration values in them to something high, like 999+ number, you should have enough time (16mins is roughly 999) in challenges, so replace every Duration value with 999 or add many zeroes after their number.
And remember that you need the Dying Light Manager for Mods to work, and they go in the USER/Documents/DyingLight/out/Data/scripts/challenges folder then.
Ah good to know. Thanks for the info. I will use that if a too difficult challenge will come and if the trainer really don't want to work on that option.
It is a bit of a work but i've done that kind of stuff before and broken few games too when changing things in files
Still it would be nice to get some kind of confirmation on the trainer that does that challenge timer option really work or do i got something funky on my computer.