Freight market jobs don't give enough time to be completed in the game

[Philo-U]

Maybe I'm missing something in how I use this tool, but whenever I create a job in this tool and then take it on (in either ETS2 or ATS), I barely get an hour (game time) into it when I am alerted that "The customer expects delivery soon... blah blah blah" and that godawful "da da-da da da" music starts playing! Have I missed it? Is there a way to set the time allocated to complete a job, or what?