title: Flutter Duration User Input
body: <p>In my app I need the user to give me a duration, I am thinking about seconds and minutes. So after pressing a button i want something like a Pop-Up Window in which the user then can select a duration by scrolling through a list and picking the minutes and seconds (or something similar to that). </p>
  
  <p>After a long internet search I can't find any template which does something like that and I really don't want to code everything by hand. I would appreciate a link to a template and if not maybe suggestions on what would be the right way to do something like that.</p>